US3938253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental instrument holder
Assignee: KURER RES AND DEV
•
Filing: 1974-10-01
•
Granted: 1976-02-17
•
Expires: 1994-10-01
Abstract
Abstract A holder for receiving dental root canal instruments consists of two circular plates arranged in coaxial spaced-apart disposition, one plate having a series of through holes therein each to receive a respective instrument with the tip thereof resting on the other plate the separation of the two plates, and thus the distance between that plate face which receives an instrument tip and the corresponding face of the other plate, being selectively adjustable to provide a datum for setting indicators on the respective instruments mounted on the holder.
Inventors
- 👤 John David William Barnard
- 👤 Peter Frank Kurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
A; A61; A61C; A61C19/00; A61C5/00; A61C5/40; A61C5/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A dental instrument holder for determining the working length for dental root canal instruments comprising 1. a base plate having a flat upper surface forming a datum plane, 2. a post extending upwardly from the base plate, 3. a holding plate having a flat upper surface, the holding plate having an aperture in which the post is received in a manner maintaining the flat upper surface of the holding plate parallel to the datum plane, the flat upper surface of the holding plate having a plurality of spaced parallel apertures extending through the holding plate in which dental root canal instruments can be received, the working length of the instruments being determined by the distance between the datum plane and the flat upper surface of the holding plate, 4. resilient means disposed around the post and acting between the base plate and the holding plate to resiliently support the holding plate for sliding movement on the post, and 5. means for locking the holding plate to the post at a selected level relative to the datum plane.
Claim 2
Dependent Claim
177 words
A dental instrument holder for determining the working length for dental root canal instruments comprising 1. a base plate having a flat upper surface forming a datum plane, 2. a post extending upwardly from the base plate, 3. a holding plate having a flat upper surface, the holding plate having an aperture in which the post is received in a manner maintaining the flat upper surface of the holding plate parallel to the datum plane, the flat upper surface of the holding plate having a plurality of spaced parallel apertures extending through the holding plate in which dental root canal instruments can be received, the working length of the instruments being determined by the distance between the datum plane and the flat upper surface of the holding plate, 4. resilient means disposed around the post and acting between the base plate and the holding plate to resiliently support the holding plate for sliding movement on the post, and 5. means for locking the holding plate to the post at a selected level relative to the datum plane.
Claim 3
Dependent Claim
26 words
A dental instrument holder according to claim 1, wherein the holding plate is circular and the post receiving aperture is centrally situated in the holding plate.
Claim 4
Dependent Claim
24 words
A dental instrument holder according to claim 1, further including 6. means for preventing rotation of the holding plate relative to the base plate.
References Cited (Backward Citations)
US3295208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |