Patent US3397620A successfully refreshed from Google Patents.
US3397620A
Expired / Lapsed
US
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Fluid actuator with annular piston locking means
Assignee: Milwaukee Cylinder Corp
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Filing: 1966-10-06
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Granted: 1968-08-20
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Expires: 1986-10-06
Abstract
No abstract record available.
Inventors
- 👤 Darold M Skelton
- 👤 John E Schultz
- 👤 Jr Robert A Bewalda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:24
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/261
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2360535A
Cited
GB573033A
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US2493875A
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US2713328A
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US2768610A
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US2813518A
Cited
US2946313A
Cited
US3173257A
Cited
US3249018A
Cited
US3267815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |