US2820518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating shear overload device
Assignee: United Engineering and Foundry Co
•
Filing: 1955-01-06
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Granted: 1958-01-21
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Expires: 1975-01-06
Abstract
No abstract record available.
Inventors
- 👤 Charles S Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:21
CPC Classifications
B; B23; B23D; B23D33/00; Y; Y10; Y10T; Y10T83/00; Y10T83/566; Y10T83/5669; Y10T83/576; Y10T83/5769; Y10T83/869; Y10T83/8719; Y10T83/8821; Y10T83/8841; Y10T83/8848
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US835998A
Cited
GB190601516A
Cited
FR374078A
Cited
US1121886A
Cited
US2164640A
Cited
US2633197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |