Patent US5638449A successfully refreshed from Google Patents.
Patent US3090360A successfully refreshed from Google Patents.
US3090360A
Expired / Lapsed
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Hydraulic actuator
Assignee: KING OF PRUSSIA RES AND DEV CORP
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Filing: 1961-09-08
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Granted: 1963-05-21
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Expires: 1981-09-08
Abstract
No abstract record available.
Inventors
- 👤 Richard A Bennett
- 👤 Harold O Kron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
B; B66; B66F; B66F1/00; B66F1/02; B66F1/04; B66F1/08; F; F01; F01B; F01B9/00; F01B9/04; F15; F15B; F15B15/00; F15B15/02; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A HYDRAULIC ACTUATOR FOR A THREADED SHAFT; SAID ACTUATOR COMPRISING, FIRST AND SECOND NUTS ADAPTED TO BE THREADED ON SAID SHAFT AT SPACED-APART POSITIONS; FIRST AND SECOND PISTONS, ONE ASSOCIATED WITH EACH OF SAID NUTS; FIRST FLUID-PRESSURE MEANS FOR THRUSTING SAID FIRST AND SECOND PISTONS ALTERNATELY AND SUCCESSIVELY AGAINST THEIR RESPECTIVE NUTS IN A COMMON AXIAL DIRECTION WITH RESPECT TO SAID SHAFT, THEREBY TO MOVE SAID SHAFT AXIALLY IN SAID DIRECTION; SECOND FLUID-PRESSURE MEANS FOR RETURNING ONE OF SAID PISTONS TO ITS START-OF-THRUST POSITION DURING AT LEAST A PORTION OF THE THRUST STROKE OF THE OTHER PISTON; AND FLUID-MOTOR DRIVE MEANS FOR DRIVING THE NUT ASSOCIATED WITH SAID RETURNING PISTON ROTATIONALLY ON SAID SHAFT IN A DIRECTION TO MOVE SAID NUT IN THE SAME AXIAL DIRECTION AS THAT IN WHICH SAID RETURNING NUT IS BEING DRIVEN, THEREBY TO RETURN NUT TO A POSITION ADJACENT TO THE RETURNED
Claim 2
Dependent Claim
147 words
A HYDRAULIC ACTUATOR FOR A THREADED SHAFT; SAID ACTUATOR COMPRISING, FIRST AND SECOND NUTS ADAPTED TO BE THREADED ON SAID SHAFT AT SPACED-APART POSITIONS; FIRST AND SECOND PISTONS, ONE ASSOCIATED WITH EACH OF SAID NUTS; FIRST FLUID-PRESSURE MEANS FOR THRUSTING SAID FIRST AND SECOND PISTONS ALTERNATELY AND SUCCESSIVELY AGAINST THEIR RESPECTIVE NUTS IN A COMMON AXIAL DIRECTION WITH RESPECT TO SAID SHAFT, THEREBY TO MOVE SAID SHAFT AXIALLY IN SAID DIRECTION; SECOND FLUID-PRESSURE MEANS FOR RETURNING ONE OF SAID PISTONS TO ITS START-OF-THRUST POSITION DURING AT LEAST A PORTION OF THE THRUST STROKE OF THE OTHER PISTON; AND FLUID-MOTOR DRIVE MEANS FOR DRIVING THE NUT ASSOCIATED WITH SAID RETURNING PISTON ROTATIONALLY ON SAID SHAFT IN A DIRECTION TO MOVE SAID NUT IN THE SAME AXIAL DIRECTION AS THAT IN WHICH SAID RETURNING NUT IS BEING DRIVEN, THEREBY TO RETURN NUT TO A POSITION ADJACENT TO THE RETURNED
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |