US3240124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic servomechanism
Assignee: Lockheed Martin Corp
•
Filing: 1963-06-12
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Granted: 1966-03-15
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Expires: 1983-06-12
Abstract
No abstract record available.
Inventors
- 👤 Robert G Howard
- 👤 Howard D Kurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:24
CPC Classifications
F; F15; F15B; F15B18/00; B; B64; B64C; B64C13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A HYDRAULIC SERVOMECHANISM COMPRISING: A HOUSING HAVING A FIRST AND SECOND POWER PISTONS AND A FIRST AND SECOND SPOOL VALVES MOUNTED THEREIN, A FIRST AND SECOND PASSAGE MEANS CONNECTING THE FIRST AND SECOND SPOOL VALVES TO THE FIRST AND SECOND POWER PISTONS RESPECTIVELY, THE SPOOL VALVES CONTROLLING FLOW OF HYDRAULIC FLUID TO THE POWER PISTONS, A PORT MEANS MOUNTED IN THE HOUSING FOR CONNECTING THE SPOOL VALVES TO A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, AN INPUT MEANS MOUNTED ON THE HOUSING FOR POSITIONING THE SPOOL VALVES SIMULTANEOUSLY TO DIRECT HYDRAULIC FLUID UNDER PRESSURE TO THE POWER PISTONS THROUGH THE PASSAGE MEANS, THE INPUT MEANS INCLUDING: (A) FIRST AND SECOND MODULATING PISTONS SLIDABLY MOUNTED IN SAID HOUSING; (B) THIRD AND FOURTH PASSAGE MEANS MOUNTED IN SAID HOUSING FOR CONNECTING SAID FIRST AND SECOND MODULATING PISTONS, RESPECTIVELY, TO A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE; (C) FIRST AND SECOND VALVE MEANS MOUNTED IN SAID HOUSING FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID THIRD AND FOURTH PASSAGE MEANS, RESPECTIVELY, IN RESPONSE TO ELECTRICAL INPUT SIGNALS; AND (D) FIRST AND SECOND LINKAGE MEANS CONNECTING SAID FIRST AND SECOND MODULATING PISTONS TO SAID FIRST AND SECOND SPOOL VALVES, RESPECTIVELY.
Claim 2
Dependent Claim
196 words
A HYDRAULIC SERVOMECHANISM COMPRISING: A HOUSING HAVING A FIRST AND SECOND POWER PISTONS AND A FIRST AND SECOND SPOOL VALVES MOUNTED THEREIN, A FIRST AND SECOND PASSAGE MEANS CONNECTING THE FIRST AND SECOND SPOOL VALVES TO THE FIRST AND SECOND POWER PISTONS RESPECTIVELY, THE SPOOL VALVES CONTROLLING FLOW OF HYDRAULIC FLUID TO THE POWER PISTONS, A PORT MEANS MOUNTED IN THE HOUSING FOR CONNECTING THE SPOOL VALVES TO A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, AN INPUT MEANS MOUNTED ON THE HOUSING FOR POSITIONING THE SPOOL VALVES SIMULTANEOUSLY TO DIRECT HYDRAULIC FLUID UNDER PRESSURE TO THE POWER PISTONS THROUGH THE PASSAGE MEANS, THE INPUT MEANS INCLUDING: (A) FIRST AND SECOND MODULATING PISTONS SLIDABLY MOUNTED IN SAID HOUSING; (B) THIRD AND FOURTH PASSAGE MEANS MOUNTED IN SAID HOUSING FOR CONNECTING SAID FIRST AND SECOND MODULATING PISTONS, RESPECTIVELY, TO A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE; (C) FIRST AND SECOND VALVE MEANS MOUNTED IN SAID HOUSING FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID THIRD AND FOURTH PASSAGE MEANS, RESPECTIVELY, IN RESPONSE TO ELECTRICAL INPUT SIGNALS; AND (D) FIRST AND SECOND LINKAGE MEANS CONNECTING SAID FIRST AND SECOND MODULATING PISTONS TO SAID FIRST AND SECOND SPOOL VALVES, RESPECTIVELY.
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |