Patent US4756691A successfully refreshed from Google Patents.
US4756691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support for removably fixing a dental prosthesis on a crown covering a pivot tooth, so-called attachments
Assignee: Individual
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Filing: 1982-05-04
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Granted: 1988-07-12
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Expires: 2002-05-04
Abstract
Abstract The supports for removably fixing a dental prosthesis on a crown covering a pivot teeth are comprised of a single hollow base fixed to the crown and a laterally cross-split stud engaged in the base. To avoid an exclusively annular engagement and consequently prevent rapid wear of the parts, the base (1) and the stud (2) have a bearing surface (6) tapered in the engagement direction (5), preferably in the form of a truncated cone. Thus, there is provided a substantially more reliable fixing without unfavorably influencing the fabrication costs.
Inventors
- 👤 Miroslaus Pilarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:10
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/265; A61C13/2656
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A support for removably connecting a dental prosthesis with a crown mounted on a foundation tooth, comprising: a sleeve-shaped socket attached to the crown; a plug-shaped member extending from the prosthesis and insertable into said socket, said plug-shaped member having slots extending crosswise on the end face of said plug-shaped member; said socket and plug-shaped member forming together a common bearing surface having a shape of a truncated cone tapering uniformly with larger cross-sectional area of said tapered truncated cone facing removal direction of said plug-shaped member.
Claim 2
Dependent Claim
87 words
A support for removably connecting a dental prosthesis with a crown mounted on a foundation tooth, comprising: a sleeve-shaped socket attached to the crown; a plug-shaped member extending from the prosthesis and insertable into said socket, said plug-shaped member having slots extending crosswise on the end face of said plug-shaped member; said socket and plug-shaped member forming together a common bearing surface having a shape of a truncated cone tapering uniformly with larger cross-sectional area of said tapered truncated cone facing removal direction of said plug-shaped member.
Claim 3
Dependent Claim
28 words
A support as defined in claim 1, wherein said socket has a cylindrical shoulder before said common bearing surface when viewed in engagement direction of said plug-shaped member.
Claim 4
Dependent Claim
28 words
A support as defined in claim 1, wherein said slots on the end face of said plug-shaped member have a recess of keyhole-shaped cross-section on their inward end.
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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |