US3299353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical speedometer utilizing unsymmetrically positioned field coils
Assignee: King Seeley Thermos Co
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Filing: 1962-06-08
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Granted: 1967-01-17
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Expires: 1982-06-08
Abstract
No abstract record available.
Inventors
- 👤 Robert A Grant
- 👤 Emmons F Sumner
- 👤 Rex R Holbrook
- 👤 George W Ince
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:29
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/487; G01P3/49; G01P3/495; G01P3/4953
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN AN ELECTRIC SPEEDMETER, THE COMBINATION OF A MAGNETIZED ROTOR, STATOR MEANS SUPPORTED ADJACENT TO AND MAGNETICALLY COUPLED WITH SAID ROTOR, SAID STATOR MEANS INCLUDING FIELD ELECTROMAGNETS HAVING WINDINGS THEREON SELECTIVELY ENERGIZED FOR PRODUCING A STEP-WISE ADVANCING FIELD OF FORCE WHICH INTERACTS WITH SAID MAGNETIZED ROTOR TO CAUSE RELATIVE ROTATION BETWEEN SAID MAGNETIZED ROTOR AND SAID STATOR MEANS IN RESPONSE TO SAID STEP-WISE ADVANCING FIELD OF FLUX, SAID RELATIVE ROTATION PRODUCING A ROTATING MAGNETIC FIELD, ALL OF SAID FIELD MAGNETS BEING GROUPED WITHIN AN ARC WHICH IS SUBSTANTIALLY LESS THAN 180* TO PREVENT REVERSALS IN THE DIRECTION OF ROTATION, SPRING RETARDED NON-MAGNETIC CONDUCTIVE SPEED-INDICATING MEANS LOCATED IN MAGNETIC INTERSECTING RELATIONSHIP WITH
Claim 2
Dependent Claim
111 words
IN AN ELECTRIC SPEEDMETER, THE COMBINATION OF A MAGNETIZED ROTOR, STATOR MEANS SUPPORTED ADJACENT TO AND MAGNETICALLY COUPLED WITH SAID ROTOR, SAID STATOR MEANS INCLUDING FIELD ELECTROMAGNETS HAVING WINDINGS THEREON SELECTIVELY ENERGIZED FOR PRODUCING A STEP-WISE ADVANCING FIELD OF FORCE WHICH INTERACTS WITH SAID MAGNETIZED ROTOR TO CAUSE RELATIVE ROTATION BETWEEN SAID MAGNETIZED ROTOR AND SAID STATOR MEANS IN RESPONSE TO SAID STEP-WISE ADVANCING FIELD OF FLUX, SAID RELATIVE ROTATION PRODUCING A ROTATING MAGNETIC FIELD, ALL OF SAID FIELD MAGNETS BEING GROUPED WITHIN AN ARC WHICH IS SUBSTANTIALLY LESS THAN 180* TO PREVENT REVERSALS IN THE DIRECTION OF ROTATION, SPRING RETARDED NON-MAGNETIC CONDUCTIVE SPEED-INDICATING MEANS LOCATED IN MAGNETIC INTERSECTING RELATIONSHIP WITH
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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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |