Patent US3478639A successfully refreshed from Google Patents.
US3478639A
Expired / Lapsed
US
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Screw type fastener
Assignee: Illinois Tool Works Inc
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Filing: 1968-09-09
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Granted: 1969-11-18
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Expires: 1988-09-09
Abstract
No abstract record available.
Inventors
- 👤 Ned Joseph Gruca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
F; F16; F16B; F16B43/00; F16B43/001; F16B5/00; F16B5/02; F16B5/0275
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124031A
Cited
US827230A
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US1028795A
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US1939737A
Cited
US2761347A
Cited
US3056234A
Cited
US3358548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |