US4871313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental pin
Assignee: LES FILS D'AUGUSTE MAILLEFER A BALLAIGUES A FIRM OFSWITZERLAND SA
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Filing: 1988-08-31
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Granted: 1989-10-03
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Expires: 2008-08-31
Abstract
Abstract The stem is tubular, being provided with an axial bore and is frusto-conical. It is provided with an outer thread as well as with a helical groove which provides therefor a resiliency enabling its section to adapt itself perfectly to the section of the root canal in which the pin is screwed.
Inventors
- 👤 Pierre-Luc Maillefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/30; A61C5/35
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A dental pin comprising a stem provided with a head, in which at least an apical part of said stem is tubular, and is provided with at least one outer thread and one helical groove.
Claim 2
Dependent Claim
35 words
A dental pin comprising a stem provided with a head, in which at least an apical part of said stem is tubular, and is provided with at least one outer thread and one helical groove.
Claim 3
Dependent Claim
30 words
A dental pin as claimed in claim 1, in which the sense of the heli of the helical groove is the reverse of that of the helix of the thread.
Claim 4
Dependent Claim
28 words
A dental pin as claimed in claim 2, in which said helical groove extends beyond the stem of the pin and bites into the head of the pin.
Claim 5
Dependent Claim
20 words
A dental pin as claimed in claim 1, in which said helical groove is of constant width throughout its length.
Claim 6
Dependent Claim
38 words
A dental pin as claimed in claim 1, in which said helical groove is of variable width, increasing from its terminal part, at the apical end of the pin, in the direction of the head of the pin.
Claim 7
Dependent Claim
30 words
A dental pin as claimed in claim 1, in which the stem is tubular and frusto-conical over practically the whole length thereof, up to the immediate vicinity of said head.
References Cited (Backward Citations)
US4759714A
Cited
US4406623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |