Patent US6334869B1 successfully refreshed from Google Patents.
US4190958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endodontic drill-file
Assignee: Individual
•
Filing: 1978-01-17
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Granted: 1980-03-04
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Expires: 1998-01-17
Abstract
Abstract This invention is an improvement in endodontic drills used by dentists specializing in root canal dentistry. Present endodontic practice in the preparation, cleaning, and shaping of root canals in teeth entails the use of inefficient steel drills. The present invention provides a diamond coated drill and file combined of a design that assures an extremely smooth canal surface to facilitate the cleaning and sealing of the root canal.
Inventors
- 👤 Howard Martin
- 👤 James P. Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; A61C5/00; A61C5/40; A61C5/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
An endodontic drill-file, comprising: a memoried flexible shaft means of very thin configuration, said memoried flexible shaft having a tapered end, said memoried flexible shaft means having a memory which returns said flexible shaft means to an original straight position of configuration from a curved position, said curved position being assumed when inserted in a curved root canal of a human tooth, when said flexible shaft means is removed from said curved root canal, and further, said memory to return said flexible shaft means to an original straight position of configuration being maintained when said flexible shaft means is rotated within said curved root canal of a human tooth and in said curved position, said curved position being assumed when inserted in said curved root canal, said curvature being transferred progressively in small increments around the periphery of said flexible shaft; and a cutting means on the surface of said flexible shaft means.
Claim 2
Dependent Claim
153 words
An endodontic drill-file, comprising: a memoried flexible shaft means of very thin configuration, said memoried flexible shaft having a tapered end, said memoried flexible shaft means having a memory which returns said flexible shaft means to an original straight position of configuration from a curved position, said curved position being assumed when inserted in a curved root canal of a human tooth, when said flexible shaft means is removed from said curved root canal, and further, said memory to return said flexible shaft means to an original straight position of configuration being maintained when said flexible shaft means is rotated within said curved root canal of a human tooth and in said curved position, said curved position being assumed when inserted in said curved root canal, said curvature being transferred progressively in small increments around the periphery of said flexible shaft; and a cutting means on the surface of said flexible shaft means.
Claim 3
Dependent Claim
23 words
The endodontic drill-file recited in claim 1 wherein the memoried flexible shaft means is formed of flexible elastic stainless steel and is tapered.
Claim 4
Dependent Claim
31 words
The endodontic drill-file recited in claim 2 and additionally, a conical end tip positioned on said tapered end of said flexible shaft means as a lead for said flexible shaft means.
Claim 5
Dependent Claim
32 words
The endodontic drill-file recited in claim 2 and additionally, a fluted end tip positioned on said tapered end of said flexible shaft means as an advancing lead for said flexible shaft means.
Claim 6
Dependent Claim
21 words
The endodontic drill-file recited in claim 1 wherein the cutting means consists of diamond particles attached to said flexible shaft means.
Claim 7
Dependent Claim
57 words
The endodontic drill-file recited in claim 1 and additionally holding means for said flexible shaft means, said holding means being capable of use for manually manipulating said flexible shaft means in a reciprocating rotary, or longitudinal direction and also for use for mechanically driving said flexible shaft means in a reciprocating, rotary as well as longitudinal direction.
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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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |