Patent US4242292A successfully refreshed from Google Patents.
US4242292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for embedding threaded apertured button in base of dental cast
Assignee: Individual
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Filing: 1979-04-09
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Granted: 1980-12-30
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Expires: 1999-04-09
Abstract
Abstract A novel method for embedding a button into a dental cast by forming a cavity and pouring a cold setting material such as a plastic into which a screw is inserted while the poured button is in the fluid form before final setting. The screw has a notch in at least one thread so that the molding material forms an interlock or detent in the notch, which is sheared upon removal of the screw.
Inventors
- 👤 Roger W. Mercer
- 👤 Louis E. Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:32
CPC Classifications
A; A61; A61C; A61C11/00; A61C11/08; B; B29; B29C; B29C39/00; B29C39/02; B29C39/10; B29C70/00; B29C70/68; A61C11/02; A61C11/06; A61C11/081; A61C11/084; A61C11/088; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; B29L2031/7536
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A method of forming a threaded aperture in the base of a hardened dental cast for use in the fabrication of a dental prosthesis, said forming method comprising the steps: (a) forming a cavity of suitable depth and diameter in the base of said dental cast, said cavity to be substantially perpendicular to the occlusal plane of said dental cast; (b) filling said cavity to a suitable depth with a fluid cold setting material; (c) forming a notch in at least one external thread of an elongated threaded member and inserting said member into said fluid cold setting material before it sets; and, (d) allowing said cold setting material to set around said elongated member and removing said member to form said threaded aperture.
Claim 2
Independent Claim
124 words
A method of forming a threaded aperture in the base of a hardened dental cast for use in the fabrication of a dental prosthesis, said forming method comprising the steps: (a) forming a cavity of suitable depth and diameter in the base of said dental cast, said cavity to be substantially perpendicular to the occlusal plane of said dental cast; (b) filling said cavity to a suitable depth with a fluid cold setting material; (c) forming a notch in at least one external thread of an elongated threaded member and inserting said member into said fluid cold setting material before it sets; and, (d) allowing said cold setting material to set around said elongated member and removing said member to form said threaded aperture.
Claim 3
Dependent Claim
22 words
A method of forming a threaded aperture in accordance with claim 1 in which said fluid cold setting material is a plastic.
Claim 4
Dependent Claim
30 words
A method of forming a threaded aperture in accordance with claim 1 in which said cavity is undercut to increase structural rigidity of said embedded button in said dental cast.
Claim 5
Dependent Claim
40 words
A method of forming a threaded aperture in accordance with claim 1 in which the wall of said cavity is provided with at least one outwardly extending detent to increase structural rigidity of said embedded button in said dental cast.
Claim 6
Dependent Claim
40 words
A method of forming a threaded aperture in accordance with claim 1 in which said screw thread has a longitudinal notch in at least the end thread of said screw thread and of a depth not exceeding the thread depth.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |