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Patent US2988060A successfully refreshed from Google Patents.
US2988060A
Expired / Lapsed
US
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Automatic speed control safety valve for hydraulic elevators
Assignee: Dover Corp
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Filing: 1958-11-21
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Granted: 1961-06-13
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Expires: 1978-11-21
Abstract
No abstract record available.
Inventors
- 👤 Duane J Arbogast
- 👤 Lawrence F Jaseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:16
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/36; B66B1/40; B66B1/405; B66B1/02; B66B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |