US4242292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for embedding threaded apertured button in base of dental cast
Assignee: Individual
•
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 12:46
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.
References Cited (Backward Citations)
US809177A
Cited
US1815956A
Cited
US2119579A
Cited
US2167176A
Cited
US2438725A
Cited
US2592288A
Cited
US2644233A
Cited
US2659145A
Cited
US2629929A
Cited
US2909806A
Cited
US2880830A
Cited
US3271498A
Cited
US3653126A
Cited
US3842877A
Cited
US3919774A
Cited
US3913230A
Cited
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 |