Patent US5964766A successfully refreshed from Google Patents.
US5964766A
Expired / Lapsed
US
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Buttress thread implant
Assignee: Respiratory Diagnostics Inc
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Filing: 1993-12-27
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Granted: 1999-10-12
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Expires: 2013-12-27
Abstract
Abstract A buttress-thread dental implant constitutes a rigid body including axially symmetric and radially uniform circumferential spiral pitch surfaces in the range or about 22 to about 28 of such pitch surfaces per axial inch. Above each pitch surface is a concave upper bevel surface which is longer than a lower bevel surface beneath each pitch surface. The intersection of each plane of each pitch surface with each plane of each lower bevel surface defines a total included bevel angle in the range of about 90 to about 1.30 degrees. The implant is also characterized by ratio of thread pitch to thread depth in the range of about 1.25:1 to about 1.40:1.
Inventors
- 👤 Leon Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:43
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0022; F; F16; F16B; F16B35/00; F16B35/04; F16B35/041
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A bone implant, comprising: a rigid body having therein axially symmetric and radially uniform circumferential spiral pitch surfaces, in the range of about 22 to about 28 of said pitch surfaces per axial inch, an upper concave bevel surface above each pitch surface which is longer than a lower bevel surface beneath each pitch surface, and each intersection of each plane of each pitch surface and each plane of each lower bevel surfaces defining a total included angle in the range of about 90 to about 130 degrees, said body having minor thread diameters at intersections of said upper and lower bevel surfaces, said spiral pitch surfaces and said minor thread diameters defining a ratio of thread pitch to thread depth in the range of about 1.25:1 to about 1.40:1.
Claim 2
Dependent Claim
130 words
A bone implant, comprising: a rigid body having therein axially symmetric and radially uniform circumferential spiral pitch surfaces, in the range of about 22 to about 28 of said pitch surfaces per axial inch, an upper concave bevel surface above each pitch surface which is longer than a lower bevel surface beneath each pitch surface, and each intersection of each plane of each pitch surface and each plane of each lower bevel surfaces defining a total included angle in the range of about 90 to about 130 degrees, said body having minor thread diameters at intersections of said upper and lower bevel surfaces, said spiral pitch surfaces and said minor thread diameters defining a ratio of thread pitch to thread depth in the range of about 1.25:1 to about 1.40:1.
Claim 3
Dependent Claim
45 words
The implant as recited in claim 1 in which each of said lower bevel surface defines a total included angle in the range of about 20 to about 30 degrees relative to a transverse radial cross-section of said implant at each minor thread diameter thereof.
Claim 4
Dependent Claim
34 words
The implant as recited in claim 2 in which said pitch surfaces comprises a ratio of a major thread diameter to said minor thread diameter in the range of about 1.2:1 to about 1.3:1.
Claim 5
Dependent Claim
21 words
The implant as recited in claim 3 in which a difference between major and minor thread diameters comprises about 0.030 inches.
Claim 6
Dependent Claim
17 words
The implant as recited in claim 2 in which said total included angle comprises about 110 degrees.
Claim 7
Dependent Claim
27 words
The implant as recited in claim 2 in which the length of said upper concave bevel surface is about twice the length of said lower bevel surface.
Claim 8
Dependent Claim
20 words
The implant as recited in claim 6 in which said upper bevel surface defines a radius of about 0.040 inches.
Claim 9
Dependent Claim
17 words
The implant as recited in claim 2, in which said lower bevel surface comprise substantially flat surfaces.
Claim 10
Dependent Claim
29 words
The implant as recited in claim 2, in which said concave upper bevel surfaces of said pitch surfaces each define a radium in a range of about 0.040 inches.
Claim 11
Dependent Claim
12 words
The implant as recited in claim 1 comprising a buttress-thread dental implant.
Claim 12
Dependent Claim
11 words
The implant as recited in claim 1 comprising an orthopedic screw.
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) | 2002-10-11 | 2003-04-12 | 2003-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-11 | 2007-04-12 | 2007-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-11 | 2011-04-12 | 2011-10-12 | $7700.00 | Window Closed / Lapsed |