US3342234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking screw
Assignee: Lock Thread Corp
•
Filing: 1966-02-09
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Granted: 1967-09-19
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Expires: 1986-02-09
Abstract
No abstract record available.
Inventors
- 👤 The Detroit Bank And Trust Co
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:14
CPC Classifications
B; B21; B21H; B21H3/00; B21H3/02; B21H3/025; F; F16; F16B; F16B25/00; F16B25/0036; F16B25/0042; F16B25/0047; F16B39/00; F16B39/22; F16B39/28; F16B39/30; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/938
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
255 words
A SELF-LOCKING SCREW HAVING A CONTINUOUS EXTERNAL GENERALLY HELICAL MALE THREAD INCLUDING A STARTING PORTION ADJACENT ONE END OF SAID SCREW, A BODY PORTION, AND A RAMP PORTION BETWEEN SAID STARTING AND BODY PORTIONS, SAID THREAD CONTINUING THROUGHOUT EACH OF SAID PORTIONS, A FEMALE MEMBER HAVING AN APERTURE AND HAVING A PREFORMED CONTINUOUS INTERNAL FEMALE THREAD MATING WITH SAID MALE THREAD, THE ROOT OF SAID STARTING PORTION BEING OF REDUCED CROSS-SECTION RELATIVE TO THE ROOT OF SAID BODY PORTION, THE ROOT OF SAID BODY PORTION IN EACH OF A PLURALITY OF CONVOLUTIONS ADJACENT SAID RAMP PORTION BEING OF ARCUATE NON-CIRCULAR CROSS-SECTION HAVING A PLURALITY OF CONVEX ARCUATELY CURVED LOBES AND INTERMEDIATE SIDES, IN EACH OF SAID PLURALITY OF CONVOLUTIONS AND LOBES BEING LOCATED FARTHER OUTWARD FROM THE AXIAL CENTER OF SAID SCREW THAN SAID SIDES, SAID LOBES AND SIDES MERGING AND BLENDING GRADUALLY WITH ONE ANOTHER TO PROVIDE A SUBSTANTIALLY SMOOTH, GENTLY RELIEVED FORM FREE OF SHARP EDGES AND PROJECTIONS, THE ROOT OF SAID RAMP PORTION CONNECTING THE ROOTS OF SAID BODY PORTION AND STARTING PORTION, SAID ROOT OF SAID RAMP PORTION BEING OF ARCUATE NON-CIRCUIT CROSS-SECTION HAVING A PLURALITY OF CONVEX ARCUATELY CURVED LOBES AND INTERMEDIATE SIDES, AND SECOND-MENTIONED LOBES BEING LOCATED PROGRESSIVELY FARTHER OUTWARD FROM THE AXIAL CENTER OF SAID SCREW FROM AND STARTING PORTION OF SAID BODY PORTION TO PROVIDE SAID ROOT OF SAID RAMP PORTION WITH A GENERALLY RADIALLY OUTWARD TAPER FROM SAID STARTING PORTION TO SAID BODY PORTION, AND SECOND-MENTIONED INTERMEDIATE SIDES BEING RADIALLY INWARDLY RELIEVED RELATIVE TO THE LINE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |