US4142293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchoring screw for dental fillings
Assignee: Individual
•
Filing: 1977-02-28
•
Granted: 1979-03-06
•
Expires: 1997-02-28
Abstract
Abstract An anchoring screw for dental fillings has a head with two indented crowns separated by a narrow neck, and a tapered shank with a thread of saw-tooth profile. Actuation of the screw by a tubular spanner or socket can be achieved with the spanner or socket inclined by up to 40° to the screw axis.
Inventors
- 👤 Jacques Tieche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/01; A61C13/02; F; F16; F16B; F16B23/00; F16B23/0061; F16B23/0007; F16B23/0023; F16B31/00; F16B31/02; F16B31/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
An anchoring screw for dental fillings, in combination with an actuating socket for screwing said screw into a tooth, said screw comprising a generally conical threaded shank having a thread of sharp-angled saw-tooth profile, a first crown formed on the upper end of the shank, a second crown formed coaxially above the first crown and separated from the latter by a narrow neck defining a circular groove between said first and second crowns, each crown having a circular toothed profile, said actuating socket being of substantially circular hollow cross-section with a toothed inside for actuating cooperation with said circular toothed profile of said second crown, said circular groove of said neck permitting said socket to be inclined at an angle of 0 to substantially about 40° from the screw axis in the operating position.
Claim 2
Dependent Claim
134 words
An anchoring screw for dental fillings, in combination with an actuating socket for screwing said screw into a tooth, said screw comprising a generally conical threaded shank having a thread of sharp-angled saw-tooth profile, a first crown formed on the upper end of the shank, a second crown formed coaxially above the first crown and separated from the latter by a narrow neck defining a circular groove between said first and second crowns, each crown having a circular toothed profile, said actuating socket being of substantially circular hollow cross-section with a toothed inside for actuating cooperation with said circular toothed profile of said second crown, said circular groove of said neck permitting said socket to be inclined at an angle of 0 to substantially about 40° from the screw axis in the operating position.
Claim 3
Dependent Claim
16 words
A screw according to claim 1 in which the two crowns have substantially the same shape.
Claim 4
Dependent Claim
19 words
A screw according to claim 1 in which each crown has the general shape of a double truncated cone.
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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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |