US3134292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irretrievable screw
Assignee: Individual
•
Filing: 1962-12-20
•
Granted: 1964-05-26
•
Expires: 1982-12-20
Abstract
No abstract record available.
Inventors
- 👤 Walton Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
F; F16; F16B; F16B23/00; F16B23/0076; Y; Y10; Y10S; Y10S411/00; Y10S411/91; Y10S411/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
AN IRRETRIEVABLE SCREW COMPRISING A STEM, A ROUNDED HEAD OF ELLIPTIC CONTOUR UPON SAID STEM AND A THREAD ON SAID STEM DESCENDING HELICALLY TO THE BOTTOM END THEREOF; SAID HEAD HAVING EXCISIONS ALONG THE NARROW SIDES THEREOF FORMING ABUTMENT SURFACES EXTENDING IN A PLANE CONTAINING THE MAJOR AXIS OF THE ELLIPTIC CIRCUMFERENCE OF SAID HEAD AND THE AXIS OF SAID STEM AND FACING IN THE DIRECTION OPPOSITE TO THE DIRECTION OF DESCENT OF SAID THREAD, AND ADJACENT TO THE BOTTOM ENDS OF SAID ABUTMENT SURFACES ARCUATE ESCAPE RAMPS LYING IN A PLANE PERPENDICULAR TO SAID STEM, SAID EXCISIONS HAVING CIRCULAR INNER SIDE WALLS AND SAID RAMPS AND SIDE WALLS EXTENDING TO THE EXTERNAL SURFACE OF SAID ROUNDED HEAD.
Claim 2
Dependent Claim
118 words
AN IRRETRIEVABLE SCREW COMPRISING A STEM, A ROUNDED HEAD OF ELLIPTIC CONTOUR UPON SAID STEM AND A THREAD ON SAID STEM DESCENDING HELICALLY TO THE BOTTOM END THEREOF; SAID HEAD HAVING EXCISIONS ALONG THE NARROW SIDES THEREOF FORMING ABUTMENT SURFACES EXTENDING IN A PLANE CONTAINING THE MAJOR AXIS OF THE ELLIPTIC CIRCUMFERENCE OF SAID HEAD AND THE AXIS OF SAID STEM AND FACING IN THE DIRECTION OPPOSITE TO THE DIRECTION OF DESCENT OF SAID THREAD, AND ADJACENT TO THE BOTTOM ENDS OF SAID ABUTMENT SURFACES ARCUATE ESCAPE RAMPS LYING IN A PLANE PERPENDICULAR TO SAID STEM, SAID EXCISIONS HAVING CIRCULAR INNER SIDE WALLS AND SAID RAMPS AND SIDE WALLS EXTENDING TO THE EXTERNAL SURFACE OF SAID ROUNDED HEAD.
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) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |