Patent US3183531A successfully refreshed from Google Patents.
US3183531A
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US
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Method of forming a screw with cutting edges
Assignee: G K N Screw & Fasteners Ltd
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Filing: 1962-09-26
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Granted: 1965-05-18
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Expires: 1982-09-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Mckewan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:37
CPC Classifications
F; F16; F16B; F16B35/00; F16B35/007; B; B21; B21H; B21H3/00; B21H3/02; B21K; B21K1/00; B21K1/56; F16B25/00; F16B25/001; F16B25/0021; F16B25/0036; F16B25/0042; F16B25/0052; F16B33/00; F16B33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2347360A
Cited
DE896037C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-17 | 1968-11-16 | 1969-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-17 | 1972-11-16 | 1973-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-17 | 1976-11-16 | 1977-05-18 | $7700.00 | Window Closed / Lapsed |