Patent US3517581A successfully refreshed from Google Patents.
US3517581A
Expired / Lapsed
US
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Self-tapping screw
Assignee: GKN Screws and Fasteners Ltd
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Filing: 1968-12-27
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Granted: 1970-06-30
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Expires: 1988-12-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth John Stokes
- 👤 John Hilton Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0021; F16B25/0036; F16B25/0084; F16B25/10; F16B25/103; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/905
Claims Analysis
Total Claims: 0
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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) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |