Patent US3494259A successfully refreshed from Google Patents.
US3494259A
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Method of providing equal flow to hydraulic cylinders
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1969-03-24
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Granted: 1970-02-10
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Expires: 1989-03-24
Abstract
No abstract record available.
Inventors
- 👤 Toyotaro Sumida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:34
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/22; B; B66; B66C; B66C19/00; B66C19/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1999834A
Cited
US2137551A
Cited
US2643664A
Cited
US3033170A
Cited
GB972080A
Cited
US3277917A
Cited
US3344940A
Cited
US3411411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |