Patent Publication Number: US-2015069005-A1

Title: Leak-free, sealed, ariless baby bottle

Description:
REFERENCE TO RELATED APPLICATION 
     This patent application is a continuation-in-part application of copending U.S. patent application Ser. No. 13/815,802, filed by Priska I. Diaz on Mar. 15, 2013 titled “Lubricious, Sealed, Airless Baby Bottle”, which itself is a continuation-in-part application of copending U.S. application Ser. No. 13/066,896, filed by Priska I. Diaz on Apr. 28, 2011 titled “Airless Baby Bottle”, which itself is a continuation-in-part of copending provisional U.S. application Ser. No. 61/351,190 filed on Jun. 3, 2010 and titled “Baby Nurser”, by Priska I. Diaz. 
    
    
     BACKGROUND OF INVENTION 
     a. Field of Invention 
     The invention relates generally to a leak-free baby bottle that is directed to accomplish a plurality of preferred goals simultaneously. Specifically, the present invention baby bottle is directed to: elimination or very significant reduction of air in the containment area of the milk or other liquid (formula, milk substitute, juice, etc.) to very significantly reduce gas-creating air during feeding; simulation of real woman breast-nipple experience by providing a unique nipple extending feature during sucking; elimination of a milk bag or pouch; and the accomplishment of the foregoing with minimal, user friendly components. Preferred embodiments also provide the following additional benefits: (1) 100% air free to help prevent gas and gas associated effects from air ingestion; (2) allows user to expel air by pushing the piston from the bottom up; (3) helps retard milk oxidation to retain nutrients that are lost when milk comes in contact with air; (4) a nipple that is designed to mimic mother&#39;s breast (nipple extends up to double length or more during sucking to train baby proper latch and aids to stop mom&#39;s sore nipple); (5) leak-proof orifices dispense milk only upon suction to allow baby to control milk flow rate; (6) stops baby&#39;s backwash to keep milk fresher longer and healthier; (7) works on suction as opposed to gravity, so infants can feed in any angle to better support development of self-feeding and faster, more successful weaning. Further, there are included herein unique component features and materials of construction that create leak proof connections and functionality of the present invention devices. 
     b. Description of Related Art 
     The following patents are representative of the field pertaining to the present invention: 
     U.S. Pat. No. 7,810,661 B2 to Murphy describes a baby-bottle apparatus for holding dry feeding formula separate from water in the bottle prior to in-situ mixing at feeding time. It combines a bottle, open and threaded at both ends, a powder chamber with a sealable, removable lid, and a piston-like pusher for releasing the lid and mixing the powder and water. 
     U.S. Pat. No. 6,871,751 B2 to Kerns et al. discloses a baby bottle nipple, comprising a fastener including a sealing surface adapted to be fastened on a baby bottle, and a wall adapted to be contacted with a baby&#39;s mouth, the wall having at least one opening to allow milk to pass through, the wall including a nipple portion with the opening being provided in the nipple portion, wherein the wall is comprised of polyisoprene rubber made with a neodymium catalyst. 
     U.S. Pat. No. 5,109,996 to Sullivan describes a nursing bottle assembly of the type in which a collapsible liquid sack having an open end and a closed end and is contained in a protective tube open at both ends that is provided with a plunger for expelling air from a collapsing liquid containing sack. The open top end of the sack is clamped by a nipple-mounting cap to one end of the tube. The hollow cylindrical plunger can be inserted into the open end of the protective outer tube opposite its nipple-carrying end. Any time liquid is being or has been withdrawn from the sack, the plunger may be manipulated by manual pressure to compress the sack toward the nipple end of the tube to reduce the volumetric capacity of the sack between its closed end and the nipple to prevent any air from accumulating in the sack space vacated by the removed liquid. 
     U.S. Pat. No. 4,010,861 to Welten describes a nursing bottle consisting of a cylindrical tube of transparent material that has slightly enlarged end portions on which a suction nipple is secured at one enlarged end by means of a threaded cap and a one-way valve is secured by means of a similar cap at the other end. A slidable piston is designed and arranged inside the tube so as to move toward the nipple end of the bottle as the liquid in the bottle decreases. 
     U.S. Pat. No. 3,184,120 to K. Undi describes a device for dispensing fluids, comprising: a tube having a hollow body of deformable, dimensionally stable material, the tube having an outlet at its top end for the fluid dispensed and being closed at its lower end, the lower end being provided with an inlet for admitting air into the tube; and a plunger positioned within the tube beneath the fluid to be dispensed, the plunger having an annular top portion in close slidable sealing engagement with the inner wall of the tube and being provided with a resiliently flexible, flared, depending annular skirt having a peripheral dimension of the hollow body of the tube, the skirt being normally resiliently urged against the inner surface of the hollow body so as to make close sealing slidable fit within the hollow body of the tube, compression of the lower end of the tube beneath the plunger compressing the air confined within the tube so as to further urge the depending flexible skirt against the inner surface of the hollow body and to maintain intimate sealing engagement therewith while advancing the plunger upwardly of the tube and dispensing the fluid in the tube through the outlet. 
     U.S. Pat. No. 3,162,318 to C. R. Woodbury Jr. describes piston means having leading and trailing transverse elements spaced apart axially, each having a peripheral portion generally conical in shape and inclined in trailing direction, the peripheral portions being substantially equal in diameter and constituting the greatest diameter of the piston means. 
     U.S. Pat. No. 3,093,256 to C. R. Woodbury Jr. describes a baby food feeder of the character disclosed comprising a tubular body member having a uniformly cylindrical inner surface extending its full length with full diameter opening at both ends, the body member being adapted for containing a quantity of flowable food, a mouthpiece having an aperture therein detachably mounted on one end of the body member and forming an air seal therewith, the opposite end of the body member defining substantially the corresponding end of the device, and performed piston means in the body member insertable through the opposite end thereof and movable in leading direction in the body member toward food therein, the piston means including a pair of axially spaced transverse elements a leading one of which faces the food and engages the inner surface of the body member, the leading element including a central substantially planar main portion and a conical peripheral portion flexible relative to the central portion and inclined in trailing direction relative to the central portion, the leading element having a possible diameter greater than the body member due to the inclination of the peripheral portion and tendency to spreading toward planar position by friction between itself and the body member in movement thereof in trailing direction, thereby enabling movement of the piston means more easily in leading direction than in trailing direction, the trailing one of the elements having a portion substantially planar in form and a peripheral portion at least as far in trailing direction as the planar portion, the trailing element also at least closely approaching the inner surface of the body member in diameter and sufficiently spaced from the leading element as to be operative for maintaining the piston means in co-axial alignment with the body member in all positions along the body member, the position means being contained in axial direction between the respective front and rear surfaces of the leading and trailing elements, the piston means further being free of mechanical connection with all other parts of the feeder including the body member and movable without restriction, by other than food in the body member and contract friction with the body member, throughout the full length of the body member and thus movable substantially completely to the end of the device opposite the mouthpiece, the opposite end of the body member being freely vented to atmosphere. 
     U.S. Pat. No. 2,898,007 to B. F. Gassaway describes a dispensing device for viscous liquid materials comprising an elongated container of uniform cross-section throughout a substantial portion of its length having flexible and resilient side walls along its longitudinal dimension, a floating stiff plunger element free to traverse the longitudinal dimension of the container, the plunger element dividing the interior of the container into two compartments, each of the compartments being unobstructed across its entire transverse dimension, one adjacent each end of the container and each substantially sealed from the other, a valve controlled air inlet at one end of the container for introducing air into the compartment adjacent the one end, and a liquid dispensing spout at the other end of the container for discharging liquid from the other compartment, the liquid dispensing spout having an aperture extending therethrough communicating at its inner end with the other compartment and a valve structure having flexible and elastic wall elements for closing the aperture by constriction of a portion of the aperture, the valve structure accommodating unidirectional flow if liquid from the interior of the other compartment to the atmosphere, the aperture being the only passage leading from the interior of the other compartment to the atmosphere. 
     U.S. Pat. No. 2,208,360 to F. M. Duerme describes a nursing bottle comprising a unitary one-piece shell open at both ends, in combination with a collapsible pouch having a restricted neck portion and arranged to be inserted in the interior of the shell, and having its open end arranged to be stretched over one end of the shell to close the same and retain the body of the pouch within the shell, and a nursing nipple adapted to be stretched over the other end of the shell, all constructed and arranged to cause an even discharge flow of liquid in drops from the shell when the nipple is compressed and the shell inverted. 
     Notwithstanding the prior art, the present invention is neither taught nor rendered obvious thereby. 
     SUMMARY OF INVENTION 
     The present invention is directed to an airless baby bottle, which includes: a) a baby bottle elongated shaft having at least one side wall, an open top and an open bottom and having a constant internal cross-section from a top view, the open top having attachment means for securing a nipple piece fastening collar thereto; b) a nipple piece fastening collar being removably attachable to the open top of the elongated shaft and having a central orifice for holding the nipple piece; c) a nipple piece having a main body with an outer rim and having a nipple with at least one liquid-release orifice, the nipple further having a top view footprint outer perimeter consistent with the elongated tube open top so as to nest thereon and under the nipple piece fastening collar, wherein when the nipple piece is situated on the elongated tube open top and the nipple piece fastening collar is placed over it and fastened to the attachment means of the elongated tube open top, a liquid impermeable seal is established; d) a piston having top view footprint outer perimeter consistent with the elongated shaft internal cross-section so as to sealably and moveably fit within the open bottom of the elongated shaft. The piston has external sides with a peripheral upper blade and a peripheral lower blade, both the peripheral upper blade and peripheral lower blade have a plurality of peripheral ridges running perpendicular to the elongated shaft elongation direction. With this airless baby bottle, a user may place the piston (which acts as an air plug) in position from the bottom of the shaft; fill the shaft with liquid food; place the nipple-collar and securely attach it to the shaft neck; and then push the piston from bottom up to expel extra air so as to eliminate all air inside the shaft, and to provide a feeding capability wherein said piston shall move upwardly through suction caused by a suction force at said nipple. Thus, milk or other liquid food is dispensed in the same manner that breasts dispense milk, and, in some preferred embodiments, through more than one orifice and only upon suction. The baby strength controls the flow rate. The tip of nipple extends inside baby&#39;s mouth upon suction just like a mother&#39;s breast. 
     In some preferred embodiments of the present invention airless baby bottle, the constant internal cross-section of the elongated shaft is circular. In other embodiments, the cross-section could be other than circular, such as oval, square, polygonal or even irregular, in which case, the attachment mechanism could be snap on or other mechanism rather than a screw-on. 
     In some preferred embodiments of the present invention airless baby bottle, the nipple includes a central liquid-release orifice and a plurality of non-central liquid-release orifices. 
     In some preferred embodiments of the present invention airless baby bottle, the nipple piece and the nipple piece fastening collar are removably attachable separate components. In yet other embodiments, the nipple piece and the nipple piece fastening collar are permanently attached to one another. 
     In some preferred embodiments of the present invention airless baby bottle, the nipple is a stretchable nipple that will move away from said nipple piece fastening collar upon suction force of at least twenty five mm Hg. 
     In some preferred embodiments of the present invention airless baby bottle, the nipple is selected from the group consisting of silicone, latex, elastomer and combinations thereof. In some preferred embodiments, the nipple lines the inside of the attachment collar so that milk never touches the material of the collar, e.g., plastic. 
     In some preferred embodiments of the present invention airless baby bottle, the piston external blades are composed of a material that includes a blend of an elastomer, polypropylene and a siloxane. 
     In some preferred embodiments of the present invention airless baby bottle, the piston external blades have at least three ridges on each blade. 
     In some preferred embodiments of the present invention airless baby bottle, the shaft includes an elastomeric grip component at its bottom. 
     In a different version of the present invention wherein the piston moves down rather than up as the milk or other liquid is consumed, the airless baby bottle, which includes: a) a baby bottle elongated shaft having at least one side wall, an open top and an open bottom and having a constant internal cross-section from a top view, the open top having attachment means for securing a nipple piece fastening collar thereto; b) a nipple piece fastening collar being removably attachable to the open top of the elongated shaft and having a central orifice for holding the nipple piece; c) a nipple piece having a main body with an outer rim and having a nipple with at least one liquid-release orifice, the nipple of the nipple piece being surrounded by and connected to a recessed areola ring so as to create a first position, being a rest position that maintains the nipple in a retracted position and so as to permit a second position, being a stressed position that is a protracted nipple position, wherein, when a baby sucks on the nipple with suction force of at least twenty five mm Hg, the nipple will elongate from the first position to the second position and upon release of the suction, will recover from the second position back to the first position the nipple further having a top view footprint outer perimeter consistent with the elongated tube open top so as to nest thereon and under the nipple piece fastening collar, wherein when the nipple piece is situated on the elongated tube open top and the nipple piece fastening collar is placed over it and fastened to the attachment means of the elongated tube open top, a liquid impermeable seal is established; d) a piston having a top view footprint outer perimeter consistent with the elongated shaft internal cross-section so as to sealably and moveably fit within the open bottom of the elongated shaft; the piston has external sides with a peripheral upper blade and a peripheral lower blade, each of the peripheral upper blade peripheral lower blade has a plurality of peripheral ridges running perpendicular to the elongated shaft elongation direction; wherein a user may place the piston in position from the bottom of the shaft; fill the shaft with liquid food; place the nipple-collar and securely attach it to the shaft; and then push the piston from bottom up to expel extra air so as to eliminate all air inside the shaft, and to provide a feeding capability wherein the piston shall move upwardly through suction caused by a suction force at the nipple. 
     In some preferred embodiments of the present invention airless baby bottle with the preferred nipple piece with the recessed areola ring, the constant internal cross-section of the elongated shaft is circular, oval, square and polygonal. 
     In some preferred embodiments of the present invention airless baby bottle with the preferred nipple piece with the recessed areola ring, the nipple includes a central liquid-release orifice and a plurality of non-central liquid-release orifices, and the recessed areola ring has an outer diameter no greater than one inch to enable a baby to create a sucking seal outside the recessed areola ring during use. 
     In some preferred embodiments of the present invention airless baby bottle with the preferred nipple piece with the recessed areola ring, the nipple piece and the nipple piece fastening collar are removably attachable separate components. 
     In some preferred embodiments of the present invention airless baby bottle with the preferred nipple piece with the recessed areola ring, the nipple piece and the nipple piece fastening collar are permanently attached to one another. 
     In some preferred embodiments of the present invention airless baby bottle with the preferred nipple piece with the recessed areola ring, the nipple is selected from the group consisting of silicone, latex, elastomer and combinations thereof. 
     In some preferred embodiments of the present invention airless baby bottle, the bottle includes: An airless baby bottle, which comprises: a) a baby bottle elongated shaft having at least one side wall, an open top and an open bottom and having a constant internal cross-section from a top view, the open top having attachment means for securing a nipple piece fastening collar thereto; b) a liquid outlet connected to the open top of the baby bottle elongated shaft, the liquid outlet selected from the group consisting of a spout, a push-pull outlet and a tube; and c) a piston having top view footprint outer perimeter consistent with the elongated shaft internal cross-section so as to sealably and moveably fit within the open bottom of the elongated shaft, the piston having external sides with a peripheral upper blade and a peripheral lower blade, each of the peripheral upper blade peripheral lower blade having a plurality of peripheral ridges running perpendicular to the elongated shaft elongation direction; wherein a user may place the piston in position from the bottom of the shaft; fill the shaft with liquid food; place the liquid outlet and securely attach it to the shaft; and then push the piston from bottom up to expel extra air so as to eliminate all air inside the shaft, and to provide a feeding capability wherein the piston shall move upwardly through suction caused by a suction force at the liquid outlet. 
     In some preferred embodiments of the present invention airless baby bottle, the liquid outlet is a spout. 
     In some preferred embodiments of the present invention airless baby bottle, the liquid outlet is a polypropylene spout. 
     In some preferred embodiments of the present invention airless baby bottle, the liquid outlet is a push-pull outlet. 
     For any embodiment of the present invention, other detailed, useful features may be included. These would include pulls inside and/or outside the pistons to enhance ease of removal; and a burping mechanism, such as an air release valve, for the piston to allow initial air between the filled liquid and the piston to escape during initial set up and prior to baby&#39;s use (this closes the gap between the milk and the piston or the milk and the end opposite the piston to further make the bottle airless during use). Burping valves, also known as air release valves, allow air to escape, but not liquids. 
     Additional features, advantages, and embodiments of the invention may be set forth or apparent from consideration of the following detailed description, drawings, and claims. Moreover, it is to be understood that both the foregoing summary of the invention and the following detailed description are exemplary and intended to provide further explanation without limiting the scope of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate preferred embodiments of the invention and together with the detail description serve to explain the principles of the invention. In the drawings: 
         FIG. 1  illustrates front, perspective exploded view of one embodiment of the present invention airless baby bottle; 
         FIG. 2  illustrates an exploded, cut view of the present invention airless baby shown in  FIG. 1 ; 
         FIG. 3  illustrates a front view of the assembled, capped present invention airless baby bottle shown in  FIGS. 1 and 2 ; 
         FIG. 4  illustrates a bottom oblique view of the capped, assembled airless baby bottle as set forth above; 
         FIG. 5  illustrates a front perspective exploded view of an alternative embodiment present invention airless baby bottle; 
         FIGS. 6A and 6B  illustrate another alternative embodiment present invention airless baby bottle utilizing a unique nipple with an areola recess that enables the nipple to have a first, detracted, rest position and a second, extended sucking position, shown recessed and extended, respectively; 
         FIG. 6C  shows a partial view of the present invention airless baby bottle of  FIG. 6B  in use by a baby; 
         FIG. 7  illustrates a front view of another alternative embodiment airless baby bottle of the present invention using a push-pull liquid outlet; 
         FIG. 8  illustrates a front view of another alternative embodiment airless baby bottle of the present invention using a spout liquid outlet; 
         FIG. 9  illustrates a front view of another alternative embodiment airless baby bottle of the present invention using a spout and straw liquid outlet; 
         FIGS. 10A ,  10 B and  10 C illustrate oblique front, top and side cut views of a preferred present invention airless baby bottle nipple piece; 
         FIG. 11  shows a side view of a preferred plunger arrangement for the present invention airless baby bottle, 
         FIG. 12  shows a side cut view thereof; 
         FIG. 13  shows a top view thereof; 
         FIG. 14  shows a bottom view thereof and 
         FIG. 15  shows a bottom oblique view thereof illustrating a pull ring feature. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Referring now in detail to the drawings wherein like reference numerals designate corresponding parts throughout the several views, various embodiments of the present invention are shown. 
     The ‘plunger’ (piston) on the present invention airless baby bottle has piston external sides with a peripheral upper blade and a peripheral lower blade, each of the peripheral upper blade and the peripheral lower blade having a plurality of peripheral ridges running perpendicular to the elongated shaft elongation direction, i.e. the piston has two opposing blades that each have multiple ridges. These blades and their ridges move up and down the inside of the bottle main elongated shaft to create a super seal to prevent leakage during use. Further, in most preferred embodiments, the blades are constructed a unique formulated blend of several materials to be both structural and flexible to create ideal water-tight seals and yet slippery enough to easily overcome friction created by the seal. They are polypropylene, at least one elastomer, and a lubricious imputing constituent, such as a siloxane or similar compound. 
     In some of those most preferred embodiments mentioned above, at least the blades of the piston are made from a plastic formula of about 10% to about 40% percent of a propylene-based elastomer (such as Vistamaxx® by Exxon Mobil), about 5% to about 20% siloxane or similar lubricity-enhancing material, and about 40% to about 85% polypropylene to increase flexibility. One formulation involves a custom blend of FDA approved material. The preferred constituent to reduce the coefficient of friction is siloxane, which is highly lubricious. The preferred polypropylene is one designed to have high heat resistance and thus is designed for thin wall molding. One such propylene is HP-544 PP (manufactured by HMC Polymers), a polypropylene homopolymer resin for thin wall injection, which has higher heat resistance and is better suited for molding thin wall designs. 
     Various composition blends were developed with the new piston design to specifically work with the new blend of materials, which includes the thin, symmetrical concave walls with concentric ridges. A mold for the new piston was created and molded pistons were made with several different ratios of polypropylene, Vistamaxx elastomer and siloxane (dimethyl siloxane, dimethyl vinyl terminated, from Dow Corning Chemical Co.). Piston performance was tested using vacuum equipment. 
     Optimized piston material blend based on test results are as follows:
         20%˜30% Vistamaxx (or a material like Vistamaxx);   8%˜12% Siloxane (or a material like Siloxane);   58%˜72% HP544 PP (Polypropylene Homopolymer Resin for Thin Wall Injection) (or a material with specs of HP544 (Polypropylene Homopolymer Resin for Thin Wall Injection)).       

     Furthermore, in some preferred embodiments, the coefficient of friction between the piston and the bottle shaft could be reduced further if the Siloxane is added to the bottle&#39;s main elongated shaft formulation at about 1% to about 5% plus PP (Polypropylene) ratio. 
       FIG. 1  illustrates front, perspective exploded view of one embodiment of the present invention airless baby bottle  100 . Baby bottle  100  includes a main elongated shaft  1 . Shaft  1  is circular in this embodiment but may have a different internal and/or external shape, such as an oval, a square with rounded corners, or other configuration, e.g., any polygon. The shaft  1  may be made of any functional material but it is preferably clear or translucent, at least in part, so that liquid level may be easily discerned. Shaft  1  may be made of glass or plastic and plastic such as polyethylene, polypropylene, or nylon may be used. Elongated shaft  1  has an open top  3  and an open bottom  5 . It has an internal cross section that is constant (except for a small, slightly widened bottom piston entry portion). The shaft  1  has an attachment means at its open top  3 . The attachment means may be a threaded area, a snap on receiver or other attachment means. In this embodiment, shaft  1  has a recessed external area  9  for force fit of a fastening collar. Shaft  1  also has an optional but preferred grip component  7  at its bottom  5 . This grip component  7  is preferably an elastomeric grip component. 
     A nipple piece fastening collar  17  is adapted to fit over and secure nipple piece  11 . Fastening collar  17  is then fitted on to recessed external area  9 . Nipple piece  11  may have an outer rim that is vertical or horizontal. Nipple piece  11  may be a conventional nipple or one that simulates a real woman&#39;s breast nipple that enable nipple  13  to stretch and release milk or other liquid when the baby is sucking on it. In this embodiment, the nipple piece  11  and the nipple piece-fastening collar  17  are preferably permanently connected to one another, but alternatively could be removably connectable. An optional protective cap  29  is also shown and is used to protect the nipple when not in use. 
     Piston  21  is a disk adapted to fit into shaft  1 . It includes a sealing ring  31  that may be made of a silicone or other effective material to enhance the sealing yet permit sliding, as described below, but silicone is a preferred material of construction, at least at the contact surfaces. Alternatively or additionally, the piston  21  is preferably made of nylon and can be internally or completely coated, molded or co-molded, with silicone. Piston  21  has optional pull rings or handles  23  and  25  for pulling it up through shaft  1  or down through shaft  1  when disassembling for cleaning, as well as to distort it or alternatively, to temporarily open an air release valve, to effect a burping air removal so that the piston comes into direct contact with the milk before the bottle is used by a baby. In addition to the features enumerated on piston  21 , the sealing ring  31  has upper and lower blades with plural sealing ridges. With this airless baby bottle  100 , a user may place the piston  21  (which acts as an air plug) in position from the bottom of the shaft  1 ; fill the shaft  1  with liquid food; place the nipple piece  11  and collar  17  on, and securely attach it to, the shaft neck; and then push the piston  21  from bottom up, to expel extra air so as to eliminate all air inside the shaft  1 , and to provide a feeding capability with a simulation of real woman breast-nipple experience to a baby, wherein the nipple  13  is extended and the piston  21  moves upward toward the top as the baby sucks the liquid. Thus, milk or other liquid food is dispensed in the same manner that breasts do, and, in some preferred embodiments, through more than one angled orifice and only upon suction. The baby strength controls the flow rate. The tip of nipple extends inside baby&#39;s mouth upon suction just like a mother&#39;s breast. 
       FIG. 2  illustrates a cut view of the present invention airless baby shown in  FIG. 1  and  FIG. 3  illustrates a front view of the assembled, capped present invention airless baby bottle  100  shown in  FIGS. 1 and 2 . Both  FIGS. 2 and 3  have numbers identical to those of  FIG. 1  and show further details of this present invention airless baby bottle. 
       FIG. 4  illustrates a bottom oblique view of the capped, assembled airless baby bottle  100 , showing details of the now inserted piston  21 . 
       FIG. 5  illustrates a front perspective exploded view of an alternative embodiment present invention airless baby bottle  200 . The Figure does not show an optional cap. Bottle  200  has an elongated shaft  201 , with a circular sidewall, an open top  203  and an open bottom  205 . The shaft  201  has a grip component  207  at or near the bottom  205 . There is a nipple piece  211  with a main body, a nipple  213 , a nipple feed orifice  219  and a rim  227 . Nipple piece fastening collar  217  fits over nipple piece  211  and via threading attaches to threads  231  of recessed area  209  of shaft  201 . Piston  221  with internal pull  223  and external pull  225  is inserted into shaft  201  in the same manner as described in conjunction with the preceding drawings. With this airless baby bottle  200 , a user may function in a fashion described above regarding the previous figures. To with, a user may place the piston (which acts as an air plug) in position from the bottom of the shaft; fill the shaft with liquid food; place the nipple-collar and securely attach it to the shaft neck; and then push the piston from bottom up to expel extra air so as to eliminate all air inside the shaft, and to provide a feeding capability with a simulation of real woman breast-nipple experience to a baby, wherein the nipple is extended and the piston moves upward toward the top as the baby sucks the liquid. Thus, milk or other liquid food is dispensed in the same manner that breasts do, and, in some preferred embodiments, through more than one angled orifice and only upon suction. The baby strength controls the flow rate. The tip of nipple extends inside baby&#39;s mouth upon suction just like a mother&#39;s breast. 
       FIGS. 6A and 6B  illustrate another alternative embodiment present invention airless baby bottle utilizing a unique nipple with an areola recess that enables the nipple to have a first, detracted, rest position and a second, extended sucking position, shown recessed and extended, respectively. Thus, in these Figures, present invention airless baby bottle  300  includes a main elongated shaft  301 . Shaft  301  is circular in this embodiment but may have a different internal and/or external shape, such as an oval, a square with rounded corners, or other configuration, e.g., any polygon. The shaft  301  may be made of any functional material, as is the case with all of the shafts described herein, and is one through which the liquid level may be easily observed. Elongated shaft  301  has an open top  303  and an open bottom  305 . It has an internal cross section that is constant (except for a small, slightly widened bottom piston entry portion). The shaft  301  has an attachment means at its open top  303 . As above, the attachment means may be a threaded area, a snap on receiver or other attachment means. In this embodiment, shaft  301  has a recessed external area for force fit of a fastening collar. Shaft  301  also has an optional but preferred grip component  307  at its bottom  305 . This grip component  307  is preferably an elastomeric grip component. 
     Piston  309  is a disk adapted to fit into shaft  301 . It includes two blades, such as upper blade  311  and is similar to piston  500  described in  FIGS. 11 through 15 , below. The piston  309  is preferably made of silicone, and most preferably made of nylon and can be internally or completely coated, molded or co-molded, with silicone. Piston  309  also has optional pull rings or handles such as are described below. Significantly, the piston  309  has upper and lower blades with plural sealing ridges. 
     A nipple piece fastening collar  315  is adapted to fit over and secure nipple piece  313 . Fastening collar  315  is then fitted on to the recessed external area of open top  303  of shaft  301 . Nipple piece  313  may have an outer rim that is vertical or horizontal. Further, nipple piece  313  is one that simulates a woman&#39;s nipple during breast feeding. It has a retracted, rest position and a significantly protruding extended position when under normal baby suction. This is achieved by a unique arrangement of the areola relative to the nipple  317   a  ( FIG. 6A ) in which the areola has a recess  319   a  that creates a well for the nipple  317   a , rendering it retracted when at rest.  FIG. 6B  shows the nipple  317   b  and the recess  319   a  both extended, as when under suction pressure of a feeding baby.  FIG. 6C  shows a partial view of the present invention airless baby bottle  300  of  FIG. 6B  in use by a baby  310  wherein lips  320  surround the recess and suck both the recess and the nipple  317   b . It should be noted that in this nipple, the recess can be no greater than one inch in diameter to function maximally. By keeping it to this size, the recess is fully enveloped by the lips of the baby and a resulting latch is created wherein the nipple itself will move in and out with sucking and release of suction. 
       FIG. 7  illustrates a front view of another alternative embodiment airless baby bottle  350  of the present invention using a push-pull liquid outlet  359 . There is an elongated shaft  351 , similar to those described above, a piston (not shown) such as are described above and below, a grip element  353 , a fastening collar  355 , and a push-pull cap  357 , with push-pull liquid outlet  359 . A user will close the push-pull, invert the bottle, fill to about an inch below full, insert the piston to seal, re-invert to upright, and open the push-pull liquid outlet and push the piston up to release any air in the shaft. It is then ready for normal use and will be a leak-free, air-free experience. 
       FIG. 8  illustrates a front view of another alternative embodiment airless baby bottle  400  of the present invention using a spout liquid outlet  413 , located off-center on lid  415 . The lid is attached securely shaft  401 . And there is a grip  407 . Other internal aspects (open top and bottom of shaft, piston, attachment means) are the same or similar to those shown above. A screw cap or snap cap for the spout liquid outlet  413  is not shown, but may be included. A user will cap the spout, invert the bottle, fill to about an inch below full, insert the piston to seal, re-invert to upright, and open the cap and then push the piston up to release any air in the shaft. It is then ready for normal use and will be a leak-free, air-free experience. 
       FIG. 9  illustrates a front view of another alternative embodiment airless baby bottle  450  of the present invention using a spout and straw liquid outlet  461 , located on-center on lid  457 . The lid is attached securely to shaft  451  with threaded collar  455 , and there is a grip  453  at the base of shaft  451 . Other internal aspects (open top and bottom of shaft, piston, attachment means) are the same or similar to those shown above. The straw  463  extends only into the neck of lid  457  at orifice  459 , and a screw cap or snap cap for the straw  463  is not shown, but may be included. A user will cap the straw, invert the bottle, fill to about an inch below full, insert the piston to seal, re-invert to upright, and open the cap and then push the piston up to release any air in the shaft. It is then ready for normal use and will be a leak-free, air-free experience. 
       FIGS. 10A ,  10 B and  10 C illustrate oblique front, top and side cut views of a preferred present invention airless baby bottle nipple piece  480 . It has a rim  481 , a dome or areola  483 , an areola well or recess  485  and a nipple  487 . Nipple  487  has a plurality of milk release orifices, such as larger central orifice  489  and off-center orifice  491 . The functionality of nipple  480  is the same as that shown in  FIGS. 6A ,  6 B and  6 C, as described above. In addition to the nipple extension upon suction, another unique feature is that if a small baby is sucking with lower pressure (e.g., 25 to 30 mm Hg), the nipple  487  will extend and milk will flow through the larger central orifice  489  and if a more forceful baby is sucking, the extended nipple will yield milk via both the central orifice and the smaller concentric orifices, such as orifice  491 . 
       FIG. 11  shows a side view of a preferred plunger arrangement for the present invention airless baby bottle,  FIG. 12  shows a side cut view thereof;  FIG. 13  shows a top view thereof;  FIG. 14  shows a bottom view thereof and  FIG. 15  shows a bottom oblique view thereof illustrating a pull ring feature. Thus, now referring to  FIGS. 11 through 15  collectively, the improved piston  500  for the above described baby bottle is shown here in great detail. It should be understood that piston  500 , described below, may be or replace any pistons in all baby bottle embodiments set forth above. As to piston  500 , variations may be implemented without exceeding the scope of the present invention. These include the top peripheral shape, which would be the shape of any baby bottle into which it is installed, the handles and dome designs, the number of ridges and the like. 
       FIG. 11  illustrates a front view of present invention baby bottle piston  500 . It includes a top  501 , in this case a dome, a bottom  529  and sidewalls with upper wiper blade  507  and lower wiper blade  509  for engagement against the inside surface of a baby bottle elongated shaft. Each of the upper and lower wiper blades  507  and  509  have a plurality of ridges. In this particular configuration, upper wiper blade  507  includes ridges  511 ,  513 ,  515  and  517 , with groves therebetween, as shown. Likewise, lower wiper blade  509  has ridges  521 ,  523 ,  525  and  527 . Further, these wiper blades extend outwardly on a thin support band  519  shown in  FIG. 10 . 
       FIG. 12  illustrates a cut side view of present invention baby bottle piston  500  with wiper blade details. In this cut Figure, it can be seen that band  519  extends outwardly from dome  501  and has a horizontal thin outcrop as shown between arrows A and B in  FIG. 10 . Directly below handle  503  located on the top, is pull ring  505  located at the bottom. Handle  503  can be used to remove the piston  500  from one end of a baby bottle elongated shaft (typically the top) and pull ring  505  can be used to remove the piston  500  from the other end of a baby bottle elongated shaft, e.g., a bottom. Other components shown in  FIG. 10 , as well as those shown in  FIGS. 11 ,  12  and  13  that are identical to those components in  FIG. 9 , are identically numbered and need not be repeatedly elaborated on. The circular inset of  FIG. 12  is a blow up of the ridges of lower wiper blade  509 . 
       FIG. 13  shows top view of the present invention piston  500  of  FIG. 9 . 
       FIG. 14  illustrates a bottom view of piston  500 , illustrating pull ring  505  and cross support walls for pull ring  505 . Likewise,  FIG. 15  shows an oblique bottom view of piston  500 , more fully showing the details of bottom pull ring  505 . 
     The piston of  FIGS. 11 through 15  may be constructed of preferred materials described above and will generally result in zero leakage over extended use as an important component of the present invention baby bottle. This leak-proof result is not obvious or easy to achieve and took years of development. It has been found that the two sets of blades (upper and lower) coupled with the plurality of peripheral ridges, provide upper and lower plural seals and also minimize the coefficient of friction between the piston and the inside of the shaft as the piston moves under the normal suction pressure of a baby. All prior art plungers lacking these elements that were available for testing, were found to not be leak-proof. 
     Although particular embodiments of the invention have been described in detail herein with reference to the accompanying drawings, it is to be understood that the invention is not limited to those particular embodiments, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined in the appended claims