Patent US2810552A successfully refreshed from Google Patents.
US2810552A
Expired / Lapsed
US
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Slip operating mechanism for rotary machines
Assignee: National Supply Co
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Filing: 1952-01-14
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Granted: 1957-10-22
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Expires: 1972-01-14
Abstract
No abstract record available.
Inventors
- 👤 Martin Dulcie Ruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:36
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1341702A
Cited
US1945876A
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US2030111A
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US2088830A
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US2245592A
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US2594446A
Cited
US2572318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |