US3233500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw with main shank threads of a given pitch merging with threads of unlike pitch on a tapered bottom end of the screw shank
Assignee: AMERICAN FASTENER CORP
•
Filing: 1962-10-23
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Granted: 1966-02-08
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Expires: 1982-10-23
Abstract
No abstract record available.
Inventors
- 👤 William A Devellier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:12
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0015; F16B25/0036; F16B25/0078; F16B25/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |