Patent US3373499A successfully refreshed from Google Patents.
US3373499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable north-indicating gyroscopic instrument
Assignee: Applied Devices Corp
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Filing: 1964-03-30
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Granted: 1968-03-19
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Rothe Wilhelm Ernst
- 👤 Loughead Aaron George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:14
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/38; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A PORTABLE GYROSCOPIC INSTRUMENT FOR DETERMINING THE LOCATIONS OF THE CARDINAL POINTS OF THE EARTH WITH RESPECT TO THE POSITION OF THE INSTRUMENT, ESPECIALLY IN FIELD USE, SAID INSTRUMENT COMPRISING A CAGE, MEANS TO SUPPORT SAID CAGE FOR ROTATION ABOUT A VERTICAL EARTH-FIXED AXIS, SAID CAGE HAVING A HOLLOW SPHERICAL INTERIOR, MOTOR MEANS FOR ROTATING SAID CAGE ABOUT SAID EARTH-FIXED AXIS, A SPHERE HAVING A MASS DISTRIBUTION PROVIDING A PREFERRED AXIS OF ROTATION, SAID SPHERE BEING LOCATED WITHIN THE CAGE, A LIQUID OF GREATER DENSITY THAN THE DENSITY OF THE SPHERE, SAID LIQUID BEING DISPOSED WITHIN THE CAGE AND BUOYING THE SPHERE AND HYDRAULICALLY COUPLING THE CAGE TO THE SPHERE FOR MUTUAL ROTATION, SAID LIQUID FORMING A THIN LIQUID BEARING FILM COMPLETELY SEPARATING THE SPHERE FROM THE CAGE TO FREELY SUPPORT THE SPHERE WITHIN SAID CAGE WHEN THE CAGE IS ROTATED, SO THAT THE AXIS OF ROTATION OF
Claim 2
Dependent Claim
148 words
A PORTABLE GYROSCOPIC INSTRUMENT FOR DETERMINING THE LOCATIONS OF THE CARDINAL POINTS OF THE EARTH WITH RESPECT TO THE POSITION OF THE INSTRUMENT, ESPECIALLY IN FIELD USE, SAID INSTRUMENT COMPRISING A CAGE, MEANS TO SUPPORT SAID CAGE FOR ROTATION ABOUT A VERTICAL EARTH-FIXED AXIS, SAID CAGE HAVING A HOLLOW SPHERICAL INTERIOR, MOTOR MEANS FOR ROTATING SAID CAGE ABOUT SAID EARTH-FIXED AXIS, A SPHERE HAVING A MASS DISTRIBUTION PROVIDING A PREFERRED AXIS OF ROTATION, SAID SPHERE BEING LOCATED WITHIN THE CAGE, A LIQUID OF GREATER DENSITY THAN THE DENSITY OF THE SPHERE, SAID LIQUID BEING DISPOSED WITHIN THE CAGE AND BUOYING THE SPHERE AND HYDRAULICALLY COUPLING THE CAGE TO THE SPHERE FOR MUTUAL ROTATION, SAID LIQUID FORMING A THIN LIQUID BEARING FILM COMPLETELY SEPARATING THE SPHERE FROM THE CAGE TO FREELY SUPPORT THE SPHERE WITHIN SAID CAGE WHEN THE CAGE IS ROTATED, SO THAT THE AXIS OF ROTATION OF
References Cited (Backward Citations)
US1890831A
Cited
US1378291A
Cited
US2044899A
Cited
US1998948A
Cited
US2950698A
Cited
US2871706A
Cited
US2911832A
Cited
GB886063A
Cited
US3162053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |