Patent US3156209A successfully refreshed from Google Patents.
US3156209A
Expired / Lapsed
US
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Autopilot for hydrofoil craft
Assignee: RTX Corp
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Filing: 1962-07-06
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Granted: 1964-11-10
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Expires: 1982-07-06
Abstract
No abstract record available.
Inventors
- 👤 Henry R Ask
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:46
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/22; B63; B63B; B63B1/00; B63B1/16; B63B1/24; B63B1/28; B63B1/285; B63B1/286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN AN AUTOMATIC CONTROL SYSTEM FOR A HYDROFOIL CRAFT, MEANS FOR SENSING AND CONTROLLING THE HEAVE OF SAID CRAFT IN VARYING SEA CONDITIONS COMPRISING CONTROL SURFACES ON SAID CRAFT, MEANS FOR PRODUCING A SIGNAL PROPORTIONAL TO THE VERTICAL ACCELERATIONS OF SAID CRAFT, MEANS FOR OPERATING UPON SAID SIGNAL TO ELIMINATE LOW FREQUENCY ACCELERATIONS, ADDITIONAL MEANS OPERATING UPON SAID SIGNAL FOR RECTIFYING SAID SIGNAL AND RETAINING THE DOWNWARD ACCELERATION PEAKS, AND MEANS FOR AVERAGING SAID DOWNWARD PEAKS TO PRODUCE A CONTROL SIGNAL FOR ACTUATING SAID CONTROL SURFACE.
Claim 2
Dependent Claim
86 words
IN AN AUTOMATIC CONTROL SYSTEM FOR A HYDROFOIL CRAFT, MEANS FOR SENSING AND CONTROLLING THE HEAVE OF SAID CRAFT IN VARYING SEA CONDITIONS COMPRISING CONTROL SURFACES ON SAID CRAFT, MEANS FOR PRODUCING A SIGNAL PROPORTIONAL TO THE VERTICAL ACCELERATIONS OF SAID CRAFT, MEANS FOR OPERATING UPON SAID SIGNAL TO ELIMINATE LOW FREQUENCY ACCELERATIONS, ADDITIONAL MEANS OPERATING UPON SAID SIGNAL FOR RECTIFYING SAID SIGNAL AND RETAINING THE DOWNWARD ACCELERATION PEAKS, AND MEANS FOR AVERAGING SAID DOWNWARD PEAKS TO PRODUCE A CONTROL SIGNAL FOR ACTUATING SAID CONTROL SURFACE.
References Cited (Backward Citations)
US2550220A
Cited
US2890671A
Cited
US2880384A
Cited
US2996271A
Cited
US2998946A
Cited
US3081728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |