Patent US3230838A successfully refreshed from Google Patents.
US3230838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual lock positioning cylinder
Assignee: Beloit Corp
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Filing: 1963-11-14
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Granted: 1966-01-25
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Expires: 1983-11-14
Abstract
No abstract record available.
Inventors
- 👤 Carl M Westbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:04
CPC Classifications
F; F15; F15B; F15B9/00; F15B21/00; F15B21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A POSITIVE LOCATING LOAD POSITIONING DEVICE COMPRISING, A CLOSED CYLINDRICAL CHAMBER WITH AN OUTER WALL HAVING FIRST AND SECOND FLUID PRESSURE INLETS AT THE ENDS, MEANS FOR SELECTIVELY DELIVERING FLUID PRESSURE TO SAID FIRST OR SAID SECOND CYLINDER ENDS, FIRST AND SECOND PISTONS SLIDABLY MOUNTED IN SAID CYLINDER, A RESILIENT FORCE TRANSMITTING CONNECTOR RIGIDLY SECURED BETWEEN SAID PISTONS, AND MEANS FOR CYCLICALLY LOCKING AND UNLOCKING EACH OF SAID PISTONS TO SAID CYLINDER WALL AT THE SAME FREQUENCY AND IN OUT OF PHASE RELATIONSHIP SO THAT EACH PISTON IS UNLOCKED FOR A PERIOD WHILE THE OTHER IS
Claim 2
Dependent Claim
96 words
A POSITIVE LOCATING LOAD POSITIONING DEVICE COMPRISING, A CLOSED CYLINDRICAL CHAMBER WITH AN OUTER WALL HAVING FIRST AND SECOND FLUID PRESSURE INLETS AT THE ENDS, MEANS FOR SELECTIVELY DELIVERING FLUID PRESSURE TO SAID FIRST OR SAID SECOND CYLINDER ENDS, FIRST AND SECOND PISTONS SLIDABLY MOUNTED IN SAID CYLINDER, A RESILIENT FORCE TRANSMITTING CONNECTOR RIGIDLY SECURED BETWEEN SAID PISTONS, AND MEANS FOR CYCLICALLY LOCKING AND UNLOCKING EACH OF SAID PISTONS TO SAID CYLINDER WALL AT THE SAME FREQUENCY AND IN OUT OF PHASE RELATIONSHIP SO THAT EACH PISTON IS UNLOCKED FOR A PERIOD WHILE THE OTHER IS
References Cited (Backward Citations)
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US2323731A
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US2524271A
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US2988058A
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |