Patent US3762848A successfully refreshed from Google Patents.
US3762848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for molding dentures
Assignee: Astron Dental Corp
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Filing: 1971-07-06
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Granted: 1973-10-02
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Expires: 1991-07-06
Abstract
Abstract The invention provides processes and equipment for fabricating dentures. The unique injection molding equipment has mold clamping forces that are higher than the injection forces to guarantee mold closure during injection of dental plastic resin. In addition, the said forces are derived from the same pressure source. By these provisions, dentures are provided wherein accurate denture duplication and/or proper fit is reliably obtained and raised bites eliminated.
Inventors
- 👤 R Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:14
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/01; A61C13/04; A61C13/20; B; B29; B29C; B29C45/00; B29C45/17; B29C45/70; A61C13/206; B29C2045/703
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
189 words
Equipment for molding plastic dentures, said equipment comprising a denture flask, mold means located in said flask, first force means associated with said flask and said mold for applying a first force forcing denture plastic into the mold cavity, second force means for applying a second force to the exterior of said mold cavity in a direction for retaining the closed dimensions of the mold cavity during the molding operation, said first force means and said second force means each being pressure actuated piston means with the pressure being derived from a common pressure source applying equal pressure to said first and second force means, said first force means comprising injection cylinder means for injecting denture plastic resin into said cavity, sprue means leading from said injection cylinder into said cavity, the plane of said sprue means being coplanar with the longitudinal dimension of said denture cavity and normal to the direction of the force applied by said second force means, and the force applied by said second force means being greater than the distending force applied by the denture plastic resin when actuated by said first force means.
Claim 2
Dependent Claim
189 words
Equipment for molding plastic dentures, said equipment comprising a denture flask, mold means located in said flask, first force means associated with said flask and said mold for applying a first force forcing denture plastic into the mold cavity, second force means for applying a second force to the exterior of said mold cavity in a direction for retaining the closed dimensions of the mold cavity during the molding operation, said first force means and said second force means each being pressure actuated piston means with the pressure being derived from a common pressure source applying equal pressure to said first and second force means, said first force means comprising injection cylinder means for injecting denture plastic resin into said cavity, sprue means leading from said injection cylinder into said cavity, the plane of said sprue means being coplanar with the longitudinal dimension of said denture cavity and normal to the direction of the force applied by said second force means, and the force applied by said second force means being greater than the distending force applied by the denture plastic resin when actuated by said first force means.
Claim 3
Dependent Claim
37 words
ThE molding equipment of claim 1 wherein said flask includes flask halves, and wherein said second force means comprises pressure actuated clamp piston means for applying pressure to said flask halves to force said flask halves together.
Claim 4
Dependent Claim
66 words
The molding equipment of claim 2 wherein said first force means for forcing denture plastic resin under pressure into the mold cavity comprises injection cylinder means, sprue means leading from said injection cylinder into said cavity, injection piston means associated with said cylinder, and means for pressure actuating said injection piston to force the dental plastic resin from said cylinder through said sprue to said cavity.
Claim 5
Dependent Claim
16 words
The molding equipment of claim 3 wherein the flask is located in a constant temperature chamber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |