US4044468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Handle for cutting and abrading instruments useful in the practice of endodontia
Assignee: Individual
•
Filing: 1976-05-03
•
Granted: 1977-08-30
•
Expires: 1996-05-03
Abstract
Abstract Improved handle means for files and reamers employed in the practice of endodontics to enable more dependable grip by the operator and to signal the operator that a desired position of the cutting surfaces is being maintained.
Inventors
- 👤 Henry Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/40; A61C5/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A file useful in root canal therapy comprising a toothed working end and a shank end, said shank end having a hangle attached thereto to be held between the thumb and index finger, said handle having two pairs of opposite faces, each of said faces being doubly concave inwardly and said faces being further characterized by different surface discontinuities for tactile differentiation therebetween.
Claim 2
Dependent Claim
63 words
A file useful in root canal therapy comprising a toothed working end and a shank end, said shank end having a hangle attached thereto to be held between the thumb and index finger, said handle having two pairs of opposite faces, each of said faces being doubly concave inwardly and said faces being further characterized by different surface discontinuities for tactile differentiation therebetween.
Claim 3
Dependent Claim
82 words
A file useful in root canal thereapy comprising a toothed working end and a shank end, said shank end having a handle attached thereto to be held between the thumb and index finger, said handle having two pairs of opposite faces, each of said faces being doubly concave inwardly and said faces being further characterized by surface indicia individual to each face which may be felt by the fingertips to signal the operator the thenorientation of the file about its longitudinal axis.
Claim 4
Dependent Claim
82 words
A file useful in root canal thereapy comprising a toothed working end and a shank end, said shank end having a handle attached thereto to be held between the thumb and index finger, said handle having two pairs of opposite faces, each of said faces being doubly concave inwardly and said faces being further characterized by surface indicia individual to each face which may be felt by the fingertips to signal the operator the thenorientation of the file about its longitudinal axis.
References Cited (Backward Citations)
US3247594A
Cited
US3562913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |