Patent US2166688A successfully refreshed from Google Patents.
US3362220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic log
Assignee: Chesapeake Instrument Corp
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Filing: 1965-05-28
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Granted: 1968-01-09
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Expires: 1985-05-28
Abstract
No abstract record available.
Inventors
- 👤 Charles M Donoho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:06
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/08; G01P5/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
APPARATUS FOR MEASURING THE SPEED OF A HIGH SHIP, AND APPARATUS BEING OF THE TYPE WHICH EMPLOYS A SENSOR TO GENERATE AN ALTERNATING CURRENT SENSE SIGNAL IN RESPONSE TO THE FLOW OF WATER BY THE HULL OF THE SHIP WHERE THE SENSE VOLTAGE IS EMPLOYED TO CONTROL THE DEVICE FOR INDICATING SAID SHIP SPEED, SAID APPARATUS COMPRISING: (A) MEANS FOR DISCRETELY STEPPING SAID SPEED INDICATING DEVICE TO A PLURALITY OF DISCRETE POSITIONS, SAID STEPPING MEANS INCLUDING A STEPPING MOTOR AND SAID SPEED INDICATING DEVICE BEING RESPONSIVE TO THE ANGULAR POSITIONS OF THE SHAFT OF SAID STEPPING MOTOR, EACH ANGULAR POSITION BEING INDICATIVE TO A SPEED OF SAID SHIP; (B) MEANS FOR GENERATING AN ALTERNATING CURRENT RESPONSE SIGNAL INDICATIVE OF THE SPEED OF SAID SHIP FROM SAID MEANS FOR DISCRETELY STEPPING THE SPEED INDICATING DEVICE;
Claim 2
Dependent Claim
134 words
APPARATUS FOR MEASURING THE SPEED OF A HIGH SHIP, AND APPARATUS BEING OF THE TYPE WHICH EMPLOYS A SENSOR TO GENERATE AN ALTERNATING CURRENT SENSE SIGNAL IN RESPONSE TO THE FLOW OF WATER BY THE HULL OF THE SHIP WHERE THE SENSE VOLTAGE IS EMPLOYED TO CONTROL THE DEVICE FOR INDICATING SAID SHIP SPEED, SAID APPARATUS COMPRISING: (A) MEANS FOR DISCRETELY STEPPING SAID SPEED INDICATING DEVICE TO A PLURALITY OF DISCRETE POSITIONS, SAID STEPPING MEANS INCLUDING A STEPPING MOTOR AND SAID SPEED INDICATING DEVICE BEING RESPONSIVE TO THE ANGULAR POSITIONS OF THE SHAFT OF SAID STEPPING MOTOR, EACH ANGULAR POSITION BEING INDICATIVE TO A SPEED OF SAID SHIP; (B) MEANS FOR GENERATING AN ALTERNATING CURRENT RESPONSE SIGNAL INDICATIVE OF THE SPEED OF SAID SHIP FROM SAID MEANS FOR DISCRETELY STEPPING THE SPEED INDICATING DEVICE;
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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) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |