US3738177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for dispensing a measured volume of a dental resin reagent
Assignee: Kerr Corp
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Filing: 1972-04-17
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Granted: 1973-06-12
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Expires: 1992-04-17
Abstract
Abstract Disclosed is a device for metering measured amounts of dental restorative resin. The device includes a cylinder and a hub arranged so that rotation of the cylinder on the hub moves the members axially a known amount to create an opening in the end surface of the cylinder. After the opening is filled with the resin, the members are rotated back, which causes the hub to push the material from the opening up to the level of the end surface of the cylinder.
Inventors
- 👤 Shirley R Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:59
CPC Classifications
B; B29; B29C; B29C31/00; B29C31/04; B29C31/06; A; A61; A61C; A61C5/00; A61C5/60; A61C5/68
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
Apparatus for presenting a measured volume of a moldable, pasty dental resin reagent to a mixing surface where the reagent is mixed with a catalyst, said apparatus comprising: a. a base member; b. a hub upstanding from said base; c. a piston with a flat end surface extending axially from said hub; d. a collar rotatable about said upstanding hub, an end surface of said collar being a mixing surface with an opening therethrough slidably receiving said piston; e. means for driving said collar axially with respect to said hub when said collar is rotated including a cam track formed about the periphery of said hub and a cam follower carried by said collar and engaging said cam track, said collar being movable between a first mixing position and a secOnd load position; f. said collar in said second position being spaced from said base to locate the end surface of said piston in said opening below the level of the mixing surface, said piston end surface and said opening together defining a chamber of known volume for receiving the pasty dental resin reagent; and g. said collar in said first position being adjacent said base to locate the end surface of said piston in said opening flush with said mixing surface, said collar movement causing said piston to slide through said opening and sweep pasty dental resin reagent from said chamber to present the reagent therein to said mixing surface.
Claim 2
Dependent Claim
241 words
Apparatus for presenting a measured volume of a moldable, pasty dental resin reagent to a mixing surface where the reagent is mixed with a catalyst, said apparatus comprising: a. a base member; b. a hub upstanding from said base; c. a piston with a flat end surface extending axially from said hub; d. a collar rotatable about said upstanding hub, an end surface of said collar being a mixing surface with an opening therethrough slidably receiving said piston; e. means for driving said collar axially with respect to said hub when said collar is rotated including a cam track formed about the periphery of said hub and a cam follower carried by said collar and engaging said cam track, said collar being movable between a first mixing position and a secOnd load position; f. said collar in said second position being spaced from said base to locate the end surface of said piston in said opening below the level of the mixing surface, said piston end surface and said opening together defining a chamber of known volume for receiving the pasty dental resin reagent; and g. said collar in said first position being adjacent said base to locate the end surface of said piston in said opening flush with said mixing surface, said collar movement causing said piston to slide through said opening and sweep pasty dental resin reagent from said chamber to present the reagent therein to said mixing surface.
Claim 3
Dependent Claim
58 words
Apparatus as set forth in claim 1, wherein said cam track has two end positions and an intermediate position, said cam follower at said intermediate position locating said hub end surface flush with said mixing surface and said cam follower at either of said end positions locating said hub end surface in said bore below said mixing surface.
Claim 4
Dependent Claim
61 words
Apparatus as set forth in claim 2, wherein the throw of said cam track from said intermediate position to one end position is larger than the throw from the intermediate position to the other end position whereby the volume of said chamber can be adjusted to either of two known volumes by rotating said collar clockwise or counterclockwise on said hub.
Claim 5
Dependent Claim
51 words
Apparatus as set forth in claim 1, wherein said cam track is formed about the periphery of said hub wholly below said mixing surface, said cam follower being captured in said cam track to move said collar towards or away from said base as said collar is rotated clockwise or counterclockwise.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |