US4389192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental reducing tool
Assignee: Individual
•
Filing: 1981-04-27
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Granted: 1983-06-21
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Expires: 2001-04-27
Abstract
Abstract A dental tool for reducing tooth structure includes a shaft adaptable to be carried by rotating means at one end thereof and a shank extending axially from the other end of the shaft. In one group of embodiments thereof, the shank has a plurality of non-intersecting grooves forming a plurality of reducing elements spaced along the length of the shank. Each of the grooves in axial cross-section of the shank has a rounded bottom wall while the reducing elements may have one of various configurations. In another group of embodiments thereof, the shank is helically grooved to define a reducing element with the crest thereof centered on the shank axis.
Inventors
- 👤 Siegmund A. Neuwirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:45
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; A61C3/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A tool for removing tooth structure comprising: a shaft adaptable to be carried by rotating means at one end thereof, a shank extending axially from the other end of said shaft, the surface of said shank being helically grooved to define a reducing element with the crest thereof lying on a helix centered on the axis of said shank, and the working surface of said reducing element being coated with a suitable abrasive material, the periphery of said reducing element tapering outwardy in the direction away from said shaft.
Claim 2
Dependent Claim
89 words
A tool for removing tooth structure comprising: a shaft adaptable to be carried by rotating means at one end thereof, a shank extending axially from the other end of said shaft, the surface of said shank being helically grooved to define a reducing element with the crest thereof lying on a helix centered on the axis of said shank, and the working surface of said reducing element being coated with a suitable abrasive material, the periphery of said reducing element tapering outwardy in the direction away from said shaft.
Claim 3
Dependent Claim
107 words
A tool for removing tooth structure comprising: a shaft adaptable to be carried by rotating means at one end thereof, a shank extending axially from the other end of said shaft, the surface of said shank being helically grooved to define a reducing element with the crest thereof lying on a helix centered on the axis of said shank, and the working surface of said reducing element being coated with a suitable abrasive material, the periphery of said reducing element tapering inwardly in the direction away from said shaft for a predetermined length of said shank and thereafter tapers outwardly in the direction away from said shaft.
Claim 4
Dependent Claim
107 words
A tool for removing tooth structure comprising: a shaft adaptable to be carried by rotating means at one end thereof, a shank extending axially from the other end of said shaft, the surface of said shank being helically grooved to define a reducing element with the crest thereof lying on a helix centered on the axis of said shank, and the working surface of said reducing element being coated with a suitable abrasive material, the periphery of said reducing element tapering inwardly in the direction away from said shaft for a predetermined length of said shank and thereafter tapers outwardly in the direction away from said shaft.
Claim 5
Dependent Claim
20 words
A tool as defined in claims 1 or 2 wherein the periphery of said reducing element defines a cylindrical configuration.
Claim 6
Dependent Claim
20 words
A tool as defined in claims 1 or 2 wherein the periphery of said reducing element defines a spheroidal configuration.
Claim 7
Dependent Claim
31 words
A tool as defined in claims 1 or 2 wherein the helical groove defines a pair of sidewalls respectively forming a substantially continuous surface with the crest of said reducing element.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |