Patent US3281581A successfully refreshed from Google Patents.
US3281581A
Expired / Lapsed
US
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Gyrocompassing system
Assignee: General Precision Inc
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Filing: 1962-06-27
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Granted: 1966-10-25
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Expires: 1982-06-27
Abstract
No abstract record available.
Inventors
- 👤 Lerman Harold
- 👤 Ferrari Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/38; G01C21/00; G01C21/10; G01C21/12; G01C21/16; G01C21/183
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
219 words
A GYROCOMPASSING A SYSTEM COMPRISING, MEANS DEFINING AN INERTIAL REFERENCE INCLUDING THREE MUTUALLY PERPENDICULAR AXIS DEFINED AS THE HEADING AXIS, THE CROSS HEADING AXIS AND THE Z AXIS, SAID Z AXIS ADAPTED TO BE ALIGNED WITH VERTICAL, FIRST INERTIAL MEANS TO INERTIALLY PRODUCE A FIRST SIGNAL REPRESENTING ACCELERATION ALONG SAID HEADING AXIS, SECOND INERTIAL MEANS TO INERTIALLY PRODUCE A SECOND SIGNAL REPRESENTING ACCELERATION ALONG SAID HEADING AXIS, RESOLVER MEANS HAVING AN INPUT SHAFT AND RESPONSIVE TO SAID FIRST AND SECOND SIGNALS TO PRODUCE AN OUTPUT SIGNAL PROPORTIONAL TO SAID FIRST SIGNAL TIMES THE SINE OF THE ANGLE REPRESENTED BY THE ANGULAR POSITION OF SAID INPUT SHAFT MINUS SAID SECOND SIGNAL TIMES THE COSINE OF THE ANGLE REPRESENTED BY THE ANGULAR POSITION OF SAID INPUT SHAFT, MEANS RESPONSIVE TO THE OUTPUT SIGNAL OF SAID RESOLVER MEANS TO ROTATE THE INPUT SHAFT OF SAID RESOLVER MEANS UNIT SAID OUTPUT SIGNAL OF SAID RESOLVER MEANS BECOMES ZERO, MEANS RESPONSIVE TO THE OUTPUT SIGNAL OF SAID FIRST INERTIAL MEANS AND THE ANGULAR POSITION OF THE INPUT SHAFT OF SAID RESOLVER MEANS TO CAUSE SAID INERTIAL REFERENCE TO PRECESS ABOUT SAID HEADING AXIS AT A RATE PROPORTIONAL TO THE OUTPUT SIGNAL OF SAID FIRST INERTIAL MEANS MINUS A CONSTANT TIMES THE COSINE OF THE ANGULAR POSITION OF THE INPUT SHAFT OF SAID RESOLVER MEANS,
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |