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US3030930A
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Hydraulic device for interlocking two hydraulic piston-cylinder units
Assignee: Individual
•
Filing: 1957-03-20
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Granted: 1962-04-24
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Expires: 1977-03-20
Abstract
No abstract record available.
Inventors
- 👤 Gratzmuller Jean Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:41
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3051; F15B2211/30515; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5153; F15B2211/55; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1550550A
Cited
US1969736A
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US2389654A
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US2401258A
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US2410978A
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US2362339A
Cited
US2717652A
Cited
US2625168A
Cited
US2648346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |