Abstract:
An improvement to a writing instrument with stylus, a pocket clip and an integrated letter-opening blade. The improvement consists of locating the letter-opening blade in the pocket clip of the pen. The blade is prevented from cutting the pocket of the user due to a blade protector that is mechanically linked to the mechanism that extends and retracts with the marking or writing tip. In an alternate embodiment, the blade is located on the opposite side of the pocket clip. The extending and retracting mechanism can be a variety of types including twists press, sliding. The stylus provides input to a PDA, touch screen or other tactile input device. Another embodiment includes a letter opener with a stylus.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
   This application is a continuation in part of application Ser. No. 11/009,342, now U.S. Pat. No. 7,416,359 filed on Dec. 10, 2004 which claims priority to application Ser. No. 10/827,877, filed on Apr. 21, 2004 now U.S. Pat. No. 7,287,925 the entire contents of which are hereby expressly incorporated by reference herein. 

   FIELD OF THE INVENTION 
   The present invention relates generally to a writing instrument with a letter opener integrated into the pocket clip and a stylus integrated into the writing instrument. More specifically the writing instrument can be a pen pencil or other type-marking instrument with a clip for holding the writing instrument onto a pocket and a stylus for use with a PDA touch screen or other tactile input device. The clip includes a protected cutting blade that can be used to open a letter of cut paper or other material. The mechanism that extends the marking tip moves the blade or protective cover, so the blade does not cut the pocket when the writing instrument is not in the marking position. The stylus may be spring loaded to absorb some of the downward pressure a user may apply to the stylus. 
   BACKGROUND OF THE INVENTION 
   People use many different types and styles of writing instruments today. Many people will receive mail or letters and will open the mail or letters using a variety of methods including tearing, or cutting open a letter using a stiletto, knife, scissors or a letter opener. In addition people may use a stylus pencil or pen with their PDA to enter or select data or information. This requires the use of two or three tools i.e. the writing instrument the opener and the stylus. Several inventions have been patented or sold that combine the some of these instruments into one. 
   U.S. Pat. No. 844,770 issued to C. G. Bauer discloses an envelope-opener where the letter opener can be connected onto a writing instrument. A letter is placed within a guide to position the envelope for opening. As the envelope is slid into the guide, the folded portion of the letter is cut open with an “L” shaped blade. While this design can be carried inside a pocket without damage to the pocket, the invention is not designed to be clipped onto a pocket. In addition, the blade remains exposed, and there is no link from the writing tip extending mechanism to the blade protector nor is stylus present in the device. 
   U.S. Pat. No. 6,065,169 issued to Cheldin discloses a combination letter opener and writing instrument. The letter opener is a similar configuration to other concealed blade letter openers that are available. This patent is disclosed as both an opener that can be attached to an existing pen, and as an opener that in integrated into the writing instrument housing. In some disclosures of this invention, the point of the pen has a retractable point. While this invention provides both a writing instrument and a letter opener, the invention fails to provide a clip for maintaining the invention on a pocket. The blade has no protection mechanism that shields the blade, and there is no link from the writing tip extending mechanism to the blade protector. Further this device does not provide a stylus. 
   WEB site www.creativeconceptsgolf.com discloses a Swiss pen that includes a writing instrument with multi-functional tools such as scissors, knife, tweezers and flashlight. While these tools can be used to open a letter, they do not provide a blade protection mechanism, and once the blade is opened, the blade is exposed without protection. This device also does not provide a stylus. 
   WEB site www.glbproducts.com and other site disclose a pen where the back cap of the pen covers a stiletto blade for opening a letter. This pen provides a writing instrument with a letter-opening tool, and in some cases, the product may include a pocket clip, but the blade is fully exposed when the rear cap is removed, and the blade is not integrated into the pocket clip. In addition, there is no link from the writing tip extending mechanism to the blade protector. This device does not provide a stylus. 
   Design U.S. Pat. D483,065, D458,635, D431,598, D390,872, and D362,649 show writing instruments with a stylus integrated within the writing instrument. But none of these design patents also provide a letter opening mechanism. They further do not provide that the stylus be spring loaded to absorb some of the downward pressure from the stylus. 
   U.S. Pat. No. 6,749,354 issued to Kageyama et al discloses a composite writing implement that combines a pen, pencil and a stylus tip. While this patent includes a stylus in a pen, it does not include a letter opener nor does it disclose a letter opener and stylus combination. 
   U.S. Pat. No. 6,450,721 issued to D&#39;Amico et al. discloses a pen stylus combination where the pen is on one end and the stylus is on the other end. While this patent includes a stylus in a pen, it does not include a letter opener nor does it disclose a letter opener and stylus combination. 
   U.S. Pat. No. 6,227,743 issued to Robb discloses a pen cap for use as a stylus on touch screens. While this patent includes a pen cap that is a stylus, it does not include a letter opener nor does it disclose a letter opener and stylus combination. 
   Other issued patents disclose letter openers, but none of the letter openers disclose a stylus integrated within the letter opener. None of the patents disclose that the stylus is spring loaded, and none of them disclose that the pen includes a letter opener with a stylus. 
   What is needed is a writing instrument with a pocket clip where a letter opener is integrated into the pocket clip. The ideal invention would not damage a pocket, by either being located on the opposite side of the pocket clip or being protected when the writing point is retracted, and the blade would be exposed when the writing point is extended. This ideal product would also include a stylus for use with a PDA, touch screen or other device that requires tactile input. 
   BRIEF SUMMARY OF THE INVENTION 
   it is an objective of the present invention to provide a writing instrument that combines a writing instrument with a letter opener and a stylus. The writing instrument includes a clip for attaching the writing instrument to a pocket with a stylus. The pocket clip includes a blade for opening a letter. The blade is prevented from causing damage to a pocket with a blade protector that is operated with mechanism that extends and retracts the writing tip. The stylus provides writing, pointing and or selecting mechanism for use with a PDA, touch screen or other tactile input device. 
   The writing instrument can take the form of many different types of instruments including pencil, pen, marker or highlighter. All these writing instruments are generally formed from an elongated cylindrical shape. The cylindrical shape is tapered on one or both ends to allow easier gripping of the writing instrument. The cylinder is generally hollow, and inside the hollow portion of the pen ink, carbon, or marking material is stored or dispensed. 
   The writing tip has generally two positions, one where the tip is concealed within the cylindrical housing, and the second position where the tip is extended outside the cylindrical housing. Numerous methods can used to extend or retract the writing tip. These methods include depressing a button on the end of the pen, twisting the pen or sliding a tab located on the side of the pen. 
   The writing instrument includes a clip that allows the writing instrument to be attached to a pocket. The clip can be molded from the material the housing is made from, or can be formed from a spring type material such as metal and be attached to the cylindrical housing. Within the clip, a letter-opening blade, which may be made from metal, is located. A blade protection mechanism is located on one or two sides of the blade to prevent damage to a pocket when the pen is clipped to a pocket. The blade protection mechanism is linked to the marking tip moving mechanism such that when the tip is extended the blade is exposed, and when the tip is retracted, the blade is at least partially covered to prevent damage to a pocket. 
   In order to open a letter, the tip of the pen is exposed. This also retracts the blade protection mechanism. If the blade is located in the back of the pocket clip, the pen is simply turned around. The fold of the letter is slid into the pocket clip, and the letter is drawn through the pocket clip and past the blade to open the letter. The letter is brought completely through the pocket clip, to open the entire folded edge of the letter. After opening the letter, the tip of the pen is retracted, and the blade is again protected so the pen can be clipped to a pocket. 
   The stylus can be located at either end of the writing instrument. The stylus can be the end of the pen a user might depress to extend the writing tip or the blade, or the stylus act like a writing tip and extend from the tip of the writing instrument. 
   Various objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, along with the accompanying drawings in which like numerals represent like components. 
   Various objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, along with the accompanying drawings in which like numerals represent like components. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a view of an embodiment of the invention with a push activated writing point extender and stylus. 
       FIG. 2  is an alternate embodiment of the invention with a twist activated writing point extender and stylus. 
       FIG. 3  is an alternate embodiment of the invention with a side activated writing point extender and stylus. 
       FIG. 4  is an alternate embodiment of the invention with a removable cap having a serrated edge on the pocket clip and stylus. 
       FIG. 5  is an alternate embodiment where the blade is located in the back of the pocket clip and stylus. 
       FIG. 6  shows a letter in position where the letter is being opened using the invention 
       FIG. 7  is an exploded view of the preferred embodiment of the pen showing the components. 
       FIG. 8  is a cross sectional view of the preferred embodiment of the pen shown with the writing tip and the blade retracted. 
       FIG. 9  is a cross sectional view of the preferred embodiment of the pen shown with the writing tip and the blade extended. 
   

   DETAILED DESCRIPTION 
   Referring first to  FIG. 1  through  FIG. 5 , that shows the invention in a variety of elongated pen configurations. The basic shape of the pen consists of cylindrical bodies, items  20  and  30  that are pressed, connected, screwed or telescope into each other at item  29 . The writing instrument can be made from a variety of materials including, metal, plastic, wood, glass or mineral such as marble, granite or rock. In the preferred embodiment the writing instrument is tapered, item  22 , at the end where the marking or writing tip extends, item  24 . The taper allows easier grasp of the writing instrument. The tapered end may also include a cushion or gripping device that makes the writing instrument easier to hold. At the end opposite the writing tip, the end may be tapered, rounded) or squared depending upon design preferences. This end may also include a writing tip actuation mechanism. The cylindrical shaft of the pen may be smooth, rough, or include a variety details item  32 , for appearance, or to improve comfort to the user. The writing instrument includes a pocket clip or retaining device, item  50  that allows the pen to be held in position on a pocket, shirt, or other thin surface. The pocket clip includes at least one pinch point, item  52  that provides a pinch point to hold the pen onto a thin surface. The pocket clip attaches to the body of the pen at item  54 . At the area where the pocket clip attaches to the pen body, a thin blade, item  60  is located. The blade may be exposed, protected, or movable based upon the construction of the pen. 
     FIG. 1 , item  1  is a pen where the writing tip, item  24 , is extended when the stylus, item  40  located on the back of the pen is pressed into the pen. Once the stylus is depressed, the writing tip extends out the tapered end of the pen, item  22 , and locks in an extended position. As the writing tip is extended the letter-opening blade, item  60  is exposed to allow the pen to open letters. The decorative details, item  32  on the side of the pen are depressions or raised areas located on the pocket clip end of the writing instrument. The letter opening blade, item  60  is located under the pocket clip. The stylus may include a spring to reduce the downward force when the stylus is used on a PDA, touch screen or other tactile input device. In some embodiments, the spring may be an integral part of the pen retraction and extension mechanism. 
     FIG. 2 , item  110  is an alternate embodiment of the invention with a twist activated writing tip extender. This figure also shows the letter-opening blade, item  60  located within the pocket clip. The end of the pen opposite the writing tip is shown as a rounded end. 
     FIG. 3 , item  210  is an alternate embodiment of the invention with a slide activating, writing tip extender, item  44 . In this embodiment, pressing button, item  42 , retracts the writing tip. The decorative details, item  32  on the side of the pen in this figure are scribed marks in the side of the surface of the writing instrument. 
     FIG. 4 , item  310  is an alternate embodiment of the invention with a removable cap. The removable cap has a serrated edge, item  56  on the pocket clip, item  50 . The serrations on the side of the pocket clip allow the pocket clip to cut or saw the letter open without causing damage to a pocket. 
     FIG. 5 , item  410  is an alternate embodiment of the invention. In this embodiment, the letter-opening blade, item  60  is located on the pocket clip on the side opposite where the clip is attached to a pocket. This embodiment shows the pen with a rear activating writing tip extender  40 , that is also a stylus, but the method of exposing the writing tip can be any variety including the removable cap type. At the end where the letter-opening blade is located, the housing is tapered or shaped, item  36 , to allow easier insertion of the letter. 
     FIG. 6  shows a letter in position where the letter is about to be opened using the invention. The letter, item  70  is brought near the pocket clip, item  52 . The flap, item  72  of the letter is opened slightly with the pocket clip. The letter is then slid down the pocket clip, item  50  until the letter makes contact with the blade, item  60 . As the letter slides across the blade  60  the flap  72  of the letter  70  is slit open. 
     FIG. 7  is an exploded view of the preferred embodiment of the pen showing the components with a stylus tip  80  on the end of the pen opposite the writing tip. This pen is a twist pen where the twist barrel  21  exists within the lower cylindrical body  20  and the upper cylindrical body  30 . The pen has an ink cartridge  45  that is placed into an ink cartridge retainer  47  that is threaded  48  and retained in one end of a twist barrel  21 . As the ink cartridge retainer  47  is rotated within the twist barrel  21  the marking tip  24  and ink cartridge  45  are translated in or out of the twist barrel  21 . The twist barrel  21  has a high pitch thread that causes approximately a 270 degree rotation of the ink cartridge within the twist barrel  21  to create a translation of 0.17 of an inch when the opposing ends of the pen are gripped and twisted  25 ,  26  in opposite directions. 
   A tapered tip  22  guides and supports the marking tip  24 . The letter opening blade  60  is fabricated with a blade arm  61 . The blade arm  61  fits into the end of the ink cartridge retainer  47  that moves the blade with the marking tip  24 . The blade  60  is protected within the pocket clip  50  that is formed in a “U” shape. A pocket clip pinch point  52  allows the pocket clip to be retained on a pocket. A hole exists on one end of the pocket clip where an end cap  51  is placed through the hole and screwed, or pressed into the end of the upper cylindrical body  30 . A stylus  80  extends through the top of the end cap  51 . The stylus  80  can be fixed or spring loaded. Cross sectional views of this preferred embodiment of the pen are shown retracted and extended in  FIGS. 8 ,  9  and described herein. 
     FIG. 8  is a cross sectional view of the preferred embodiment of the pen shown with the writing tip and the blade retracted.  FIG. 9  is a cross sectional view of the preferred embodiment of the pen shown with the writing tip and the blade extended. Twist barrel  21  is manufactured from a variety of companies. The operation of the twist barrel  21  translates all items ( 24 ,  45 ,  47 ,  60 , and  61 ) that are secured to the twist barrel  21  when the inner and outer cylindrical bodies are turned on opposite directions. The lower cylindrical body  20  is secured to the outer portion of the twist barrel  21 . The upper cylindrical body  30  fits over the ink cartridge retainer  47 , blade  60  and the blade arm  61  extends to blade  60  that is allowed to translate within slot  31 . In operation, rotation of the upper cylindrical body  30  on the lower cylindrical body  20  causes the blade  60  to turn slightly when after pocket clip  50  contacts the blade. Additional rotation will cause rotation of the twist barrel  21  that will move the blade  60  and the marking tip  24  in unison. When the blade is exposed and the two halves of the pen ( 20 ,  30 ) are rotated, in a direction opposite of the extending direction, the blade  60  will again rotate slightly when it makes contact with one of the walls of the pocket clip. Further rotation will cause the blade to translate within the pocket clip to protect the blade at the same time the marking tip is being retracted within the tapered tip  22 . The blade arm  61  is fixedly but removably secured into the ink cartridge retainer  47  to allow the blade to be changed or replaced. In the preferred embodiment the blade arm  61  is frictionally held in the ink cartridge retainer. 
   The tapered tip  22  both prevents marking of the marking tip  24  when the tip is retracted and provides a guide for the marking tip  24  out the end of the tapered tip  22  to support side forces on the marking tip  24 . The end cap  51  has a spring loaded stylus  80 . The spring  81  pushes the stylus to an outward position. Force on the stylus  80  will move the stylus into the end cap to reduce harm to a PDA, touch screen or other tactile input device. While a spring is shown and described in this embodiment it is also contemplated that the stylus is not spring loaded. 
   When the blade  60  is exposed from under the pocket clip  50  the blade can be used to open a letter as shown and described in  FIG. 6 . In the blade retracted position the pocket clip  50  covers both sides of the blade and prevents accidental cutting of a pocket. A user would normally retract the marking tip  24  when a pen is placed on or in pocket and the movement of the blade provides protection of the blade  60  when the marking tip  24  is retracted. The end of the pocket clip  50  has a pinch point  52  to help retain the pen on a pocket. 
   In a simplified embodiment a letter opener is combined with a stylus. In this simplified embodiment, the letter opening blade  60  and stylus  80  exists in an elongated housing with a stylus  80  on one end of the elongated body and a letter opening blade  60  located on the same or the opposite end of the stylus  80 . It is also contemplated that the elongated body has a stylus  80  on both sides and or the letter opener be located on both ends. It is further contemplated in this embodiment, that the writing instrument be located in the elongated body. Additionally this embodiment may have a pocket clip  50  where the blade  60  is integrated in the pocket clip  50 , and a blade protector may be used to cover the blade  60  when inserted into a pocket. 
   Thus, specific embodiments and applications for a writing instrument with an integrated letter-opening blade have been disclosed. It should be apparent, however, to those skilled in the art that many more modifications besides those described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims.