Abstract:
A microvaporizer having a combustion heating device to vaporize stored fluids to produce vapors, including methods to supply fluid to the combustion heating device by pressure induced by a switch that releases pressure, a spring, or a negative pressure induced by a user&#39;s sucking action on a mouthpiece of the microvaporizer.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates to a handheld vaporizer or microvaporizer, particularly the vaporizer uses combustion to vaporize fluids to produce vapor. 
         [0002]    The conventional handheld vaporizers or microvaporizers used as electronic cigarettes or electronic cigars are powered by electricity, through the forms of batteries or by plugging the vaporizer to an electrical outlet. To provide the vaporizer the ability of receiving, storing, and transforming electrical energy into heat energy for vaporization, the vaporizers are often bulky or heavy to carry. If using disposable battery, the vaporizers also tend to require frequent changes to the battery; or if the battery were rechargeable, it would require frequent charges to the battery. 
       BRIEF SUMMARY OF THE INVENTION 
       [0003]    The present invention provides an alternative to the electrically powered handheld vaporizers or microvaporizers by using combustion, instead of electricity, to produce vapors. 
         [0004]    Heating by combustion with flames or without flames may allow liquids to vaporizer more cleanly because heating by combustion having a more consistent heating temperature. Heating by combustion also allows heat to be provided within a short time, such as instantaneously as the heating device is engaged. This method also allows the heat source to be shut off instantaneously, and avoid overheating of the vaporizer components and over-vaporize the store fluids. Heaving the ability of turning on and shutting off the heat source instantaneously also provides an added safety feature to the vaporizer. 
         [0005]    A microvaporizer using combustion to vaporizer fluids include an outer casing that forms a mouthpiece on a first end of the outer casing, and a vaporization section that includes a combustion heating device and a fluid transport device, and a storage chamber on a second end of the outer casing that includes a combustion fluid and a stored fluid for vaporization. The combustion heating device vaporizes fluid drawn from the stored fluid by the fluid transport device. 
         [0006]    A method of vaporization using combustion includes storing a combustion fuel in a storage chamber of a vaporizer; storing a stored fluid for vaporization in a storage chamber of a vaporizer; supplying the combustion fuel to a combustion heating device inside a vaporization section of a vaporizer; delivering the stored fluid to the combustion heating device for vaporization using a fluid transport device; and vaporizing the stored fluid using combustion heating. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  illustrates an embodiment vaporizer that incorporates vaporization by a heating element using combustion. 
           [0008]      FIG. 2  illustrates a first method to supply fluid to a vaporization section by supplying pressure from a combustible fluid to a collapsible container that is filled with stored fluid. 
           [0009]      FIG. 3  illustrates a second method to supply fluid to a vaporization section by compartmenting a storage section in a vaporizer to store both stored fluid and combustible fluid on either side of a movable seal. 
           [0010]      FIG. 4  illustrates a third method to supply fluid to a vaporization section by using a spring to provide pressure to a collapsible container that is filled with stored fluid. 
           [0011]      FIG. 5  illustrates a fourth method to supply fluid to a vaporization section by using a spring to provide pressure to a movable seal that sections off a stored fluid in a compartmentalized storage section of a vaporizer. 
           [0012]      FIG. 6  illustrates a fifth method to supply fluid to a vaporization section by using a fluid transport device that includes a pipe having a diameter that is in a size that provides a droplet smaller than a natural droplet. 
           [0013]      FIG. 7  illustrates a sixth method to supply fluid to a vaporization section by using a wicking device that supplies fluid via a capillary action of the liquid on the wicking device. 
           [0014]      FIG. 8  illustrates an alternative embodiment vaporizer in the shape of a pipe that incorporates vaporization by a heating element using combustion. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0015]    The present invention provides a handheld vaporizer or microvaporizer that produces vapors through combustion. The vaporizer includes a combustion heating section and a storage section that may be reusable or disposable. The general concept of the present invention is to use a combustion device, such as a flame or flameless combustion heating device, to vaporize the desired fluid that may be provided to the heating device. 
         [0016]      FIG. 1  shows an embodiment of a combustion vaporizer  1  having a generally cylindrical shape with a mouthpiece. The combustion vaporizer  1  includes a vaporization section  3 , a connector section  5 , and a storage section  7 . The combustion vaporizer  1  includes a mouthpiece  11  that is formed as a part of the exterior casing  13  that encases the vaporization section  3 . The vaporization section  3  includes a combustion heating device  20  that can be a flame torch or a flameless heating device that is connected to and controlled by a valve  22 . 
         [0017]    The combustion heating device  20  draws combustion fuel  28  from a storage chamber  9  inside the storage section  7  of the vaporizer using a fluid transport device  40 . The amount of combustion fuel  28  drawn from the storage chamber  9  through a valve  22 . The valve  22  is regulated by a fuel control  23 , which is supplied by fuel connector  26  that is embedded in the connector section  5  of the vaporizer  1 , and the fuel  28  is transported to the combustion heat device  20  through tube  24  inside the storage chamber  9 . The combustion heating device  20  may include a nozzle which releases the fuel as a fine spray, such as by atomizing the fuel. The fine spray is ignited, mixes with atmospheric oxygen and combusts. The combustion heats the coil  42  and vaporizes the fluid within the coil. The flame from combustion may or may not be applied directly to the coil  42  of the fluid transport conduit. For example, the flame may be confined to a chamber within the combustion heating device to heat a disc  21  or other structure that is adjacent and conforms to the coil. Heat from the disc or other structure heats the coil and the fluid flowing through the coil. 
         [0018]    The amount of combustion, e.g., flame, may be restricted to avoid heating to excessive temperatures, such as above 350 degrees Fahrenheit, the vapor in the transport conduit  40 . Similarly, the flame should not excessively heat the atmospheric air in the vaporization section  3  which is inhaled by the user. The combustion fuel  28  may be any combustible fuel that can be compressed or easy to transport, for example, ethanol, liquid butane and petroleum naptha. 
         [0019]    A flameless heating device may also be used as the heating device. An example of a flameless heating device is a water-activated exothermic chemical heater. The heating device may be a chamber containing magnesium metal, iron and a salt. When water is added to the chamber, an exothermic chemical reaction occurs that generates heat. The fluid conduit  40  passes through the chamber. Heat generated in the chamber vaporizes fluid passing through the fluid conduit. 
         [0020]    The stored fluid  46  is kept in a fluid compartment  48  located inside the storage section  7 . The fluid compartment  48  may be separated from or enclosed in the combustion fuel  28  in the storage chamber  9 . The fluid compartment  48  is operatively connected to the vaporization section  3  by the connector section  5 . Fluid in the fluid component  48  is transported by a fluid transport device  40  with a valve  44 , which is connected to and controlled by a fluid control  45  that is connected to the fluid compartment  48  through the connector section  5 . The fluid transport device  40  may include a pipe, a string, a hollow coil  42 , or any other suitable conduit to deliver fluid to the flame or heat generated by the combustion heating device  20 . A coil  42  of the fluid transport device provides an extended passage that is in the heat generated by the combustion heating device. 
         [0021]    The fluid control  45  can control the amount of fluid to be dispensed during a single use to the fluid transport device  40 . The fluid transport device  40  may be connected to a vaporization component  42  that is located in close proximity to the combustion heating device  20 , such that the combustion heating device  20  provides the heat to vaporize the fluid that is supplied to the vaporization component  42  by fluid transport device  40  and become vapor  52 . Vapor  52  exits the vaporization section  3  through exit  50  that is supplied to a user through a mouthpiece  11 . 
         [0022]    The vaporization component  42  may be made as a part of the fluid transport device  40 , such as a pipe that is in a in a closely looped form as shown in  FIG. 1 . The vaporization component  42  also may be a pipe that is in a different shape, such as an enlarged pipe, or in any other shape or type of conduit that may be suitable to form a vaporization chamber. The vaporization component  42  also may be a separate component from the fluid transport device  40 , and is operatively connected to fluid transport device  40 , such that stored fluid  46  can be supplied to the vaporization component  42 . The vaporization component  42  provides a chamber or a surface for vaporization to occur. The stored fluid  46  may be heated and vaporized inside the chamber or on the surface of the vaporization component  42  by the combustion heating device  20 . 
         [0023]      FIGS. 2 to 6  show various exemplary methods of providing stored fluid to the vaporization component  42  may be applied to the vaporizer described and shown in  FIG. 1 .  FIG. 2  depicts a first method to provide stored fluid  207  to a vaporization section  230  in the form of a cartridge  200 . The cartridge  200  includes an outer casing  201  that defines a storage chamber  202  that is sealed from the atmosphere. The storage chamber  202  contains a combustible fluid  203  that is either in pressurized gas form or in liquid form, and a collapsible container  205  that is enclosed in the combustible fluid  203 . The collapsible container  205  is sealed from the storage chamber  202 . 
         [0024]    The collapsible container  205  encases a stored fluid  207  that is operatively provided using a fluid transport device to a vaporization section  230  of a vaporizer. The stored fluid  207  is vaporized in the vaporization section  230  to provide the desired vapor to a user. The collapsible container  205  is fluidly connected to a fluid control  210  and a fluid valve  212 , both of which are connected to a pipe  214  that may act as a fluid transport device, and supplies the stored fluid  207  to the vaporization section  230 . 
         [0025]    In this method, the stored fluid  207  is pushed through the valve  212  by applying pressure from the combustible fluid  203  onto the collapsible container  205 . The pressurized combustible fluid  203  in storage chamber  202  provides a pressure that constantly surrounds the collapsible container  205 , and the pressure from the combustible fluid  203  and the collapsible container  205  reach an equilibrium when the fluid valve  212  is not engaged. When the fluid valve  212  is engaged by a user, the balance of pressure inside the storage chamber  202  and the collapsible container  205  would be disrupted, during which the pressure from the combustible fluid  203  would induce the collapsible container  205  to contract, and the stored fluid  207  would be pushed from the collapsible container  205  through the fluid control  210  and fluid valve  212  into the pipe  214 . The collapsible container  205  may be fixedly embedded into the outer casing  201 , such that the collapsible container  205  and storage chamber  202  are engaged as one single disposable cartridge  200 . Alternatively the collapsible container  205  may be releasable from the outer casing  201  to be replaced. 
         [0026]    The cartridge  200  may be manufactured by forming an outer casing  201  having an engagement channel  216  that houses the fluid valve  212  and fluid control  210 , and forming a storage chamber  202  in the outer casing  201  that includes a hook compartment  218  for the installation of a collapsible container  205 . After the collapsible container  205  is installed, and the combustible fluid  203  is filled into the storage chamber  202 , a flap  209  may be used to seal the storage chamber  202 . The storage chamber  202  may also be reopened to the atmosphere by opening flap  209 , such that the storage chamber  202  may be refilled, and the collapsible container  205  may be removed and replaced. 
         [0027]    The engagement channel  216  may include threads that matched threads on fluid valve  212  to ensure a sealed engagement between the fluid valve  212  and the collapsible container  205 . 
         [0028]      FIG. 3  depicts a second method to provide stored fluid  307  to the vaporization section  330  in the form of a cartridge  300 . Cartridge  300  includes an outer casing  301  that defines a storage chamber  302 . The storage chamber  302  is sealed from the atmosphere using a flap  309 . The outer casing  301  also may include an engagement channel  316  that houses the fluid valve  312  and fluid control  310 . Fluid valve  312  is connected to a fluid transport device, such as a pipe  314 , which is operatively connected to a vaporization section  330  of the vaporizer. 
         [0029]    The engagement channel  316  may include threads that matched threads on fluid valve  312  to ensure a sealed engagement between the fluid valve  312  and the storage chamber  302 . 
         [0030]    Using an inner divider  316 , the storage chamber  302  is partially divided into two sections. The inner divider  316  is located such that the engagement channel  316  is fully located on the side of the compartment II of the inner divider  316 , and is not fluidly connected to compartment I. Compartment II is further divided into compartment IIA and IIB by a movable seal  305  that seals compartment IIB from compartment IIA. The compartment IIB is defined by the movable seal  305 , the outer casing  301  and the inner divider  316 , and is fluidly connected to the fluid control  310  and fluid valve  312 . Compartment I and compartment IIA are fluidly connected with each other. However, compartment IIB is not fluidly connected with compartments I and IIA. Compartment I and IIA stores combustible fluid  303 , and compartment IIB contains stored fluid  307  for vaporization. 
         [0031]    When the fluid valve  312  is not engaged by a user, the combustible fluid  303  asserts a pressure against the movable seal  305  that is returned by the stored fluid  307 , such that an equilibrium of pressure is achieved on either side of the movable seal  305 . When the fluid valve  312  is engaged by a user, pressure balance between compartment I and IIA and compartment IIB is disrupted by the release of pressure by the fluid valve  312 , and the pressure from combustible fluid  303  pushes the movable seal towards the fluid valve  312 , contracting the volume of compartment IIB to rebalance the equilibrium of pressure. When compartment IIB is contracted, the stored fluid  307  is simultaneously pushed to exit the valve  312  to be supplied to pipe  314  to be transported to the vaporization section  330 . 
         [0032]    The cartridge  300  may be used as a disposable or refillable cartridge. The cartridge  300  may be manufactured by forming the outer casing  301 , filing compartment IIB with the stored fluid  307  then sealing the compartment IIB with the movable seal  305 , filling the compartments I and IIA with combustible fluid  303 , then sealing the storage chamber  302  from the atmosphere using the flap  309 . The cartridge  300  may be also be refilled by opening flap  309  to access the compartments I, IIA and IIB in storage chamber  302 . 
         [0033]      FIG. 4  depicts a third method to provide stored fluid  407  to the vaporization section  430  in the form of a cartridge  400 . The cartridge  400  includes an outer casing  401  that includes an engagement channel  416  for to house a fluid control  410  and fluid valve  412  that is operatively connected to the pipe  414 . 
         [0034]    The outer casing  401  also defines a storage chamber  402  that contains a spring  420  and a collapsible container  405 . The storage chamber  402  is sealed by flap  409 . The collapsible container  405  may be engaged in the outer casing  401  through a hook compartment  418 , which seals the collapsible container  405  from the storage chamber  402 . 
         [0035]    The engagement channel  416  may include threads that matched threads on fluid valve  412  to ensure a sealed engagement between the fluid valve  412  and the collapsible container  405 . 
         [0036]    A spring  420  is used to push the stored liquid  407  to the fluid transport device, such as pipe  414 . A first end of the spring  420  is rested upon flap  409 , and a second end of the spring  420  is rested upon the collapsible container  405 . The collapsible container  405  contains a stored fluid  407  for vaporization, such that when the fluid valve  412  is not engaged by the user, the pressure of the stored fluid  407  inside the collapsible container  405  is at an equilibrium with the spring  420 . The spring  420  is configured such that a slight reduction in the air pressure in the vaporization section  13  causes the stored fluid to flow through the fluid valve. The slight reduction may be caused by a user inhaling while biting the mouthpiece and drawing air from the vaporization section  13 . 
         [0037]    When a user engages the fluid valve  412 , the fluid valve  412  opens the collapsible container  405  to the atmosphere and reduces the pressure in the collapsible container  405 . The reduction in pressure disrupts the pressure equilibrium between the collapsible container  405  and the spring  420 , such that the spring provides more pressure to the collapsible container  405 , and simultaneous the stored fluid  407  is pushed through the fluid valve to exit the collapsible container  405  into the pipe  414 . 
         [0038]    The cartridge  400  may be disposable, or may be refillable. The cartridge  400  is manufactured by forming a first of the outer casing  401  with an engagement channel  416  to engage the fluid valve  412  and fluid control  410 , forming a storage chamber  402  that includes a hook portion  418  close to the engagement channel  416 , such that the collapsible container  405  is embedded or sealed to the outer casing  401  to be fluidly connected only to the fluid control  410  and fluid valve  412 , engaging a first end of a spring  420  to an end of the collapsible container  405  and engaging a second end of the spring  420  to a flap  409  that seals a second end of the outer casing  401  from the atmosphere. The cartridge  400  may be reopened at the flap  409 , and the collapsible container  405  may be replaced or refilled with stored fluid  407 . 
         [0039]      FIG. 5  shows a fourth method to provide stored fluid  507  to the vaporization section  530  in the form of a cartridge  500 . The cartridge  500  is formed by an outer casing  501 , which includes an engagement channel  516  that houses a fluid control  510  and a fluid valve  512 , and defines a storage chamber  502  that is sealed by a flap  509 . The fluid control  510  and fluid valve  512  are connected to a fluid transport device, such as a pipe  514 , that supplies a stored fluid  507  in the cartridge  500  to a vaporization section  530  in a vaporizer. 
         [0040]    The engagement channel  516  may include threads that matched threads on fluid valve  512  to ensure a sealed engagement between the fluid valve  512  and the storage chamber  502 . 
         [0041]    The storage chamber  502  is divided into two compartments, I and II, by a movable seal  505 . Compartment I encases a stored fluid  507  that is fluidly connected to the fluid control  510  and fluid valve  512 . Compartment I is sealed off from compartment II by the movable seal  505 . Compartment II houses a spring  520  that has a first end engaged on the movable seal  505 , and a second end supported by the flap  509 . When the fluid valve  512  is not engaged by a user, the spring  520  provides pressure to the movable seal  505  such that the pressure of the stored fluid  507  pushing against the movable seal  505  in compartment I is at an equilibrium with the spring  520 . 
         [0042]    When a user engages the fluid valve  512 , the pressure in compartment I is reduced, and the pressure equilibrium is disrupted. The spring  520  would push the movable seal  505  towards the stored fluid  507 , reducing the volume of compartment I, and simultaneously push the stored fluid  507  to exit the fluid valve  512  into pipe  514  to be supplied to the vaporization section  530 . 
         [0043]    Cartridge  500  may be manufacture by forming the outer casing  501  with an engagement channel  516  to house a fluid control  510 , adding a stored fluid  507  to the storage chamber  502  and sealing the storage chamber  502  to section the storage chamber into compartments I and II, adding a spring to compartment II, and sealing the storage chamber  502  with a flap  509 . Cartridge  500  may be disposable, or may be refillable by reopening the flap  509 , and refilling the stored fluid  507  in the storage chamber  502 . 
         [0044]    Alternatively, the stored liquid may be supplied to the vaporization section of a vaporizer using pressure change that is directly induced by a user of the vaporizer.  FIG. 6  shows a fifth embodiment  600  that provides stored liquid  607  to a combustion heating device  630 . The embodiment  600  includes an outer casing  601 , which defines a vaporization chamber  642  that is connected to a mouthpiece  640  on one end of the vaporization chamber  642 , which is open to the atmosphere. The outer casing  601  includes an air hole  618  on a second end of the vaporization chamber  642  that allows air  622  to be drawn into the vaporization chamber  642 . 
         [0045]    The outer casing  601  also forms a support  616  that engages with a fluid transport device  614  which supplies stored fluid  607  to the vaporization section  642  to be vaporized by the combustion heating device  630 . The fluid transport device  614  fluidly communicates between the vaporization section  642  and a collapsible container  605  that contains stored fluid  607 . The collapsible container  605  may be attached to the outer casing  601  such that the collapsible container  605  is permanently sealed to the section of the outer casing  601  that includes the support  616  and fluid transport device  614 . The collapsible container  605  may also be detachable from the outer casing  601  such that the collapsible container  605  may be replaced or refilled with stored fluid  607 . 
         [0046]    The collapsible container  605  may be fluidly connected to the vaporization section  642  through the fluid transport device  614 . The fluid transport device  614  may be, for example, a pipe that has a diameter that supplies fluid to the combustion heating device  630  in a size that is smaller than a natural droplet of fluid. The size of the diameter of the pipe would be such that the fluid in the pipe would not be drawn out of the pipe in atmospheric pressure. The stored fluid  607  in the collapsible container  605  may be supplied to the fluid transport device  614  by a capillary action of the stored fluid  607  from one end of the fluid transport device  614  that is in fluid communication with the stored fluid  607 . When the vaporizer is not engaged by a user, pressure between the stored fluid  607  in the collapsible container  605  would be at an equilibrium with the stored fluid  614  present in the fluid transport device  614 . 
         [0047]    When a user engages the mouthpiece  640  and applies a sucking pressure to the mouthpiece  640 , the user induces a negative pressure lower than the atmospheric pressure in the vaporization section  642  that would draw the stored fluid  607  to exit the fluid transport device  614  to be supplied to the combustion heating device  630 . The amount of stored fluid  607  drawn to the combustion heating device  630  directly relates to the amount of sucking pressure applied by a user. 
         [0048]    The negative pressure in the vaporization section  642  would be quickly balanced back to atmospheric pressure using air flow  622  that would be drawn through the air hole  618  by the negative pressure induced by the user simultaneously when the stored fluid  607  is drawn from the liquid transportation device  614 . As the pressure in the vaporization section  642  is returned to atmospheric pressure, the drawing action of the stored liquid  607  would also stop. The collapsible container  605  may contract as the volume of the stored liquid  607  is reduced. 
         [0049]    The embodiment  600  may be a single manufactured cartridge that is fully disposable, or may be partially disposable by replacing or refilling the collapsible container  605  with new stored fluid  607 . 
         [0050]      FIG. 7  shows a sixth embodiment that provides stored fluid  707  to a combustion heating device  730 . The embodiment  700  includes an outer casing  701 , which defines a vaporization chamber  742  that is connected to a mouthpiece  740  on one end of the vaporization chamber  742 , which is open to the atmosphere. The outer casing  701  includes an air hole  718  on a second end of the vaporization chamber  742  that allows air  722  to be drawn into the vaporization chamber  742 . 
         [0051]    The outer casing  701  also forms a support  716  that engages with a fluid transport device, such as a wick  714 , which supplies stored fluid  707  to the vaporization section  742  to be vaporized by the combustion heating device  730 . The wick  714  fluidly communicates between the vaporization section  742  and a container  705  that contains stored fluid  707 . The container  705  may be attached to the outer casing  701  such that the container  705  is permanently sealed to the section of the outer casing  701  that includes the support  716  and wick  714 . The container  705  may also be detachable from the outer casing  701  such that the container  705  may be replaced or refilled with stored fluid  707 . 
         [0052]    The container  705  may be fluidly connected to the vaporization section  742  through the wick  714 . The stored fluid  707  in the container  705  may be supplied to the wick  714  by a capillary action of the stored fluid  707  from a first end of the wick  714  that is in fluid communication with the stored fluid  707 , towards a second end of the wick  714  that is optimally connected to or close in proximity with the combustion heating device  730 . 
         [0053]    When the vaporizer is not engaged by a user, pressure between the stored fluid  707  in the collapsible container  705  would be at an equilibrium with the stored fluid  714  present in the fluid transport device  714 . When a user engages the mouthpiece  740  and applies a sucking pressure to the mouthpiece  740 , the user induces a negative pressure lower than the atmospheric pressure in the vaporization section  742  that would draw the stored fluid  707  onto the wick  714  to be supplied to the combustion heating device  730 . The amount of stored fluid  707  drawn to the combustion heating device  730  directly relates to the amount of sucking pressure applied by a user. 
         [0054]    The negative pressure in the vaporization section  742  would be quickly balanced back to atmospheric pressure using air flow  722  that would be drawn through the air hole  718  by the negative pressure induced by the user simultaneously when the stored fluid  707  is drawn from the wick  714 . As the pressure in the vaporization section  742  is returned to atmospheric pressure, the drawing action of the stored liquid  707  would also stop. 
         [0055]    The embodiment  700  may be a single manufactured cartridge that is fully disposable, or may be partially disposable by replacing or refilling the container  705  with new stored fluid  707 . 
         [0056]    The use of vaporization through combustion heating can be applied to another embodiment vaporizer in the shape of a pipe as shown in  FIG. 8 . The pipe  800  is formed by an outer casing  801  that includes a mouthpiece  840 , using which a user would draw vaporized fluid  824  from the pipe  800 . The pipe  800  also includes a top opening  803  that may be covered by a lid  805 . Combustion fluid and stored liquid for vaporization are encased inside the pipe  800 , and as can be seen through the top opening  803 , the stored liquid may be transported to a combustion heating device  830  using a fluid transport device  814  in the shape of a pipe that allows fluid to be vaporized inside the pipe, and returns the vaporized fluid  824  to exit towards the mouthpiece  840 . The fluid transportation device  814  may be any suitable forms of device that supplies stored fluid towards the combustion heating device. The method of fluid transportation to be applied to the pipe  800  may be any of the above described methods shown in  FIGS. 2 to 7 . 
         [0057]    Advantages of the present invention includes reducing manufacturing costs and material costs by eliminating the need for a battery or battery casing, increasing product versatility and portability by reducing the weight of the vaporizer, improving safety of the product by reducing toxic vapors during use, and improving the controllability of the vaporizer by providing fast heat delivery and shut-off. 
         [0058]    While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.