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US2784754A
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US
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Hydraulic systems
Assignee: BERTHELSEN ENGINEERING WORKS I
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Filing: 1952-04-11
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Granted: 1957-03-12
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Expires: 1972-04-11
Abstract
No abstract record available.
Inventors
- 👤 Berthelsen Viggo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:38
CPC Classifications
B; B27; B27D; B27D3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1772599A
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US2061658A
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US2247988A
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US2209608A
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US2302115A
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US2390159A
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US2301028A
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US2526342A
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US2558796A
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US2618302A
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US2593691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |