US3294995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tachometer generator
Assignee: Reliance Electric and Engineering Co
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Filing: 1963-03-11
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Granted: 1966-12-27
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Expires: 1983-03-11
Abstract
No abstract record available.
Inventors
- 👤 John D Edick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:27
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/487; H; H02; H02K; H02K7/00; H02K7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A TACHOMETER GENERATOR COMPRISING, IN COMBINATION, A STATOR, A BEARING IN SAID STATOR, A ROTOR JOURNALLED IN SAID BEARING, A PERMANENT MAGNET CARRIED ON ONE OF SAID ROTOR AND STATOR AND HAVING PAIRS OF POLES THEREON, A GENERATOR OUTPUT WINDING CARRIED ON THE OTHER OF SAID ROTOR AND STATOR AND COOPERATING WITH SAID MAGNET, SAID TACHOMETER GENERATOR HAVING A MAGNETIC CIRCUIT INCLUDING SAID ROTOR AND STATOR WITH A PERMEANCE COEFFICIENT IN THE RANGE BELOW 10.0, AND SAID PERMANENT MAGNET BEING MADE OF MATERIAL OF ABOUT 8% ALUMINUM, 15% NICKEL, 24% COBALT, 3% COPPER, 1% TITANIUM AND THE BALANCE BEING IRON, WHEREBY HEATING OF SAID MAGNET WITHIN A GIVEN RANGE ABOVE AVERAGE ROOM TEMPERATURE OF ABOUT 20 DEGREES C. HAS SUBSTANTIALLY NO EFFECT ON THE FIELD STRENGTH OF SAID PERMANENT MAGNET OF SAID TACHOMETER GENERATOR AND, ACCORDINGLY, SUBSTANTIALLY NO EFFECT ON THE OUTPUT VOLTAGE THEREOF.
Claim 2
Dependent Claim
144 words
A TACHOMETER GENERATOR COMPRISING, IN COMBINATION, A STATOR, A BEARING IN SAID STATOR, A ROTOR JOURNALLED IN SAID BEARING, A PERMANENT MAGNET CARRIED ON ONE OF SAID ROTOR AND STATOR AND HAVING PAIRS OF POLES THEREON, A GENERATOR OUTPUT WINDING CARRIED ON THE OTHER OF SAID ROTOR AND STATOR AND COOPERATING WITH SAID MAGNET, SAID TACHOMETER GENERATOR HAVING A MAGNETIC CIRCUIT INCLUDING SAID ROTOR AND STATOR WITH A PERMEANCE COEFFICIENT IN THE RANGE BELOW 10.0, AND SAID PERMANENT MAGNET BEING MADE OF MATERIAL OF ABOUT 8% ALUMINUM, 15% NICKEL, 24% COBALT, 3% COPPER, 1% TITANIUM AND THE BALANCE BEING IRON, WHEREBY HEATING OF SAID MAGNET WITHIN A GIVEN RANGE ABOVE AVERAGE ROOM TEMPERATURE OF ABOUT 20 DEGREES C. HAS SUBSTANTIALLY NO EFFECT ON THE FIELD STRENGTH OF SAID PERMANENT MAGNET OF SAID TACHOMETER GENERATOR AND, ACCORDINGLY, SUBSTANTIALLY NO EFFECT ON THE OUTPUT VOLTAGE THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |