Patent US2543989A successfully refreshed from Google Patents.
US2543989A
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Hydraulic system for operating hydraulic cylinders and pistons
Assignee: LA PLANT-CHOATE MANUFACTURING Co Inc
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Filing: 1945-02-28
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Granted: 1951-03-06
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Expires: 1965-02-28
Abstract
No abstract record available.
Inventors
- 👤 Harvey W Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:49
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/844
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US833931A
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US1588656A
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US1588659A
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US2153056A
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US2109668A
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US2247140A
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US2226192A
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US2210144A
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US2267284A
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US2377278A
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US2367682A
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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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |