US4449935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tooth crown remover
Assignee: HARRIS WILLIAM H DDS
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Filing: 1983-02-22
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Granted: 1984-05-22
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Expires: 2003-02-22
Abstract
Abstract An elongated mandrel is coaxially secured at one end to one end of a larger diameter handle. The other end portion of the mandrel converges and terminates in an annular outstanding shoulder facing the handle. A sleeve-like hammer slidably surrounds the mandrel and is spring urged for impacting on the adjacent handle end when manually moved away from the handle and released. The hammer is provided with an outstanding flange adjacent the handle for manually moving the hammer away from the handle.
Inventors
- 👤 William H. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:52
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/16; A61C3/164
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A tooth crown remover, comprising: an elongated handle having an end surface forming an anvil; a mandrel coaxially secured to the anvil end of said handle, the end portion of said mandrel opposite the handle coaxially converges away from the handle and terminates in an annular shoulder facing the handle normal to the mandrel axis; a sleeve-like hammer longitudinally slidably surrounding the end portion of said mandrel adjacent said handle; and, spring means interposed between said hammer and said mandrel for biasing said hammer toward said handle, the end portion of said mandrel adjacent said handle being diametrically reduced to form an annular space for nesting said spring means.
Claim 2
Dependent Claim
109 words
A tooth crown remover, comprising: an elongated handle having an end surface forming an anvil; a mandrel coaxially secured to the anvil end of said handle, the end portion of said mandrel opposite the handle coaxially converges away from the handle and terminates in an annular shoulder facing the handle normal to the mandrel axis; a sleeve-like hammer longitudinally slidably surrounding the end portion of said mandrel adjacent said handle; and, spring means interposed between said hammer and said mandrel for biasing said hammer toward said handle, the end portion of said mandrel adjacent said handle being diametrically reduced to form an annular space for nesting said spring means.
Claim 3
Dependent Claim
22 words
The tooth crown remover according to claim 1 in which said hammer is provided with an annular outstanding flange adjacent said handle.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |