Dispensing – Collapsible wall-type container – Plural container and/or compartment
Reexamination Certificate
2001-03-20
2002-07-09
Derakshani, Philippe (Department: 3754)
Dispensing
Collapsible wall-type container
Plural container and/or compartment
C222S095000, C222S326000, C206S222000
Reexamination Certificate
active
06415955
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to an improved apparatus and method for extruding plaster, and more specifically to a device for dispensing a plaster preparation, including dispensing apparatus and disposable cartridges. The cartridges consist of a plastic bag-like container, having a predetermined amount of plaster powder enclosed therein. Also, within the container is a second burstable container having a measured amount of water therein.
At the time of use the bag-like container is compressed bursting the water container. The package is kneaded until the desired consistency has been reached. One distal end is compressed forming a cylindrical nozzle-like end.
The ejector gun is comprised of a cylindrical container having a removable nozzle at one distal end and a piston at the other. The cylindrical container also has a handle with a trigger connected to the piston for advancing the piston compressing the plaster paste toward the ejector nozzle.
The plaster paste container is inserted into the injector gun by removing the ejector gun nozzle and inserting the plaster tube or container therein. The plate tube soft nozzle-like end is positioned within the ejector gun nozzle as the ejector gun nozzle is attached to the ejector gun.
As the ejector gun trigger is depressed the ejector gun piston compresses the plaster tube mixture. The ejector gun piston increases the pressure until the soft nozzle is slightly extruded from the ejector gun nozzle. The extruded portion extending from the ejector nozzle is clipped whereby the contents of the bag can be expelled using the ejector gun handle. Once the plaster has been expelled from the soft container the ejector gun nozzle is removed and the empty soft container is disposed. Because the soft package covers all interior surfaces of the ejector gun there is no cleanup of the ejector gun.
2. Description of the Prior Art
There are other apparatus for designed for dispersing plaster. Typical of these is U.S. Pat. No. 4,081,256 issued to Donnelly on Mar. 28, 1978.
Another patent was issued to Cliff et al. on Jul. 15, 1980 as U.S. Pat. No. 4,212,840. Yet another U.S. Pat. No. 4,842,165 was issued to Van Coney on Jun. 27, 1989 and still yet another was issued on Sep. 5, 1989 to Perler as U.S. Pat. No. 4,863,072.
Another patent was issued to Martin on Mar. 29, 1994 as U.S. Pat. No. 5,297,698. Yet another U.S. Pat. No. 5,304,239 was issued to Schwa et al., on Apr. 19, 1994. Another was issued to Dragan on Feb. 6, 1996 as U.S. Pat. No. 5,489,207 and another was issued on Apr. 29, 1997 to Wilcox et al., as U.S. Pat. No. 5,624,260, and still yet another was to Cannon on Jan. 19, 1999 to as U.S. Pat. No. 5,860,739.
U.S. Pat. No. 4,081,256
Inventor: William R. Donnelly
Issued: Mar. 28, 1978
A particulate composition producing an endothermic reaction when mixed with water, and a cold pack containing such a composition, and water isolated therefrom until the intended time of use. The composition consists essentially of, in parts by weight, about 65 to about 130 parts urea, about 35 to about 80 parts hydrated sodium acetate (Na C.sub.2 H.sub.3O.sub.2.multidot.3H.sub.2 O), about 18 to about 40 parts potassium chloride, potassium nitrate, or mixtures thereof, about 18 to about 30 parts ammonium chloride, and about 6 to about 10 parts quar gum. A cold pack comprises an outer sealed, flexible, impermeable enclosure containing the composition, and an inner sealed, flexible, impermeable, easily ruptured enclosure containing about 85 to about 140 parts by weight water. The pack reaches and maintains a temperature of about −7.degree. C. for up to 30 minutes, and is moldable to conform to the surfaces being cooled.
U.S. Pat. No. 4,212,940
Inventor: George S. Cliff, et al.
Issued: Jul. 15, 1980
This invention concerns an improved apparatus for extruding abrasive pastes, especially those which contain ground glass together with polymerizable material, and which comprises a conventional piston and cylinder extrusion apparatus in which the working surfaces are protected by a replaceable lining system consisting of a thin tubular liner and two discs substantially closing its ends and enclosing the paste to be extruded. In the preferred embodiment (FIG. 1) the lining system is made of polypropylene.
U.S. Pat. No. 4,842,165
Inventor: Robert H. Van Coney
Issued: Jun. 27, 1989
A resilient squeeze bottle-dispensing package capable of dispensing viscous products without excessive air entrainment and belching on successive dispensing cycles. In a preferred embodiment, the viscous product is preferably suspended inside a resilient squeeze bottle in a thin flexible bag. The flexible bag is secured about its perimeter to the interior of the squeeze bottle at its top and approximately at its midpoint to facilitate both complete emptying of product and desirable suckback characteristics when the opposed squeezing forces are removed from the resilient outer wall of the bottle. A suckback valve is located between the dispensing orifice in the shroud of the package and the flexible bag to limit the amount of air which can enter the package through the dispensing orifice at the conclusion of each dispensing cycle and to prevent slumping of viscous product remaining in the shroud into the bottom of the flexible bag between dispensing cycles. An air check valve is preferably provided in the bottom of the resilient squeeze bottle to facilitate a pressure buildup within the bottle when opposed squeezing forces are applied thereto.
U.S. Pat. No. 4,863,072
Inventor: Robert Perler
Issued: Sep. 5, 1989
Apparatus for the delivery of light-curable composite dental filling material comprises a tubular composite reservoir, plunger and slider. The slider is free to move longitudinally along the reservoir but is matingly mounted to facets on the outside surface of the reservoir to prevent angular movement of the slider relative to the reservoir. The plunger consists of a shaft threaded to mate with the threaded inside diameter of the composite reservoir. The plunger also has a disk integrally formed to end of the shaft at one end and a male front piece at the other. The male front piece mates with a female fitting of a separate composite extrusion element.
U.S. Pat. No. 5,297,698
Inventor: Thomas W. Martin
Issued: Mar. 29, 1994
An assembly for mixing and dispensing preparations such as dental cements includes a capsule and a lever actuated dispensing device. The capsule is received in a first orientation of the dispensing device for initial movement of a piston of the capsule to combine two components in a mixing chamber of the capsule. The capsule is received in a second orientation when dispensing of the components is desired. The capsule includes flanges engageable with one or more retention members of the dispensing device, and the flanges are positioned to substantially utilize the mechanical advantage provided by the dispensing device regardless of whether the capsule is in the first orientation or in the second orientation. The flanges are also arranged to substantially prohibit bursting of the capsule when the components are discharged from the mixing chamber, and essentially preclude dispensing of the components when the capsule is in the first orientation.
U.S. Pat. No. 5,304,293
Inventor: Peter Schwabe et al.
Issued: Apr. 19, 1994
In the preparation of a dental appliance wherein an investment compound is mixed with a liquid and then cast, the improvement wherein the investment compound is a plaster- or phosphate-bound investment compound which is free of an anionic surface-active agent and containing an iso-paraffin of the formula ##STR1## in which n denotes 2, 3, 4 or 5.
U.S. Pat. No. 5,489,207
Inventor: William B. Dragan
Issued: Feb. 6, 1996
A manual dental extruder or syringe gun having a front end with rigid side walls and an opening therein adapted to receive a dental cartridge, capsule, ampoule or tip having a flange. The body portion of the cartridge has a diameter less than that of the lateral
Derakshani Philippe
Kroll Michael I.
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