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US2690765A
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Hydraulic operating apparatus
Assignee: Walworth Co
•
Filing: 1951-07-14
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Granted: 1954-10-05
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Expires: 1971-07-14
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Krummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:54
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/18; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86035; Y10T137/86059; Y10T137/86131; Y10T137/86163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1589389A
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US1616841A
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US2440060A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |