US3521916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary keyed insert bushing
Assignee: HUMBOLDT MACHINE WORKS Inc
•
Filing: 1968-11-18
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Granted: 1970-07-28
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Expires: 1988-11-18
Abstract
No abstract record available.
Inventors
- 👤 George F Hitt
- 👤 Neal M Renfro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
CPC Classifications
B; B27; B27B; B27B5/00; B27B5/29; B27B5/30; B27B5/32; F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0876; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T403/7021; Y10T403/7047; Y10T83/00; Y10T83/768; Y10T83/7793
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1251844A
Cited
US2337854A
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US2614832A
Cited
US2905490A
Cited
US3003830A
Cited
US3122384A
Cited
US3138032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |