US3287680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device
Assignee: Automatic Timing and Controls Inc
•
Filing: 1963-06-18
•
Granted: 1966-11-22
•
Expires: 1983-06-18
Abstract
No abstract record available.
Inventors
- 👤 Grover K Houpt
- 👤 Edward T Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:15
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A TEMPERATURE-COMPENSATED TRANSFORMER ASSEMBLY COMPRISING: (A) A PRIMARY WINDING ADAPTED TO BE COUPLED TO A SOURCE OF AN EXCITING A.C. VOLTAGE, (B) A SECONDARY WINDING MOUNTED FOR MUTUAL INDUCTIVE COUPLING WITH SAID PRIMARY WINDING, (C) A RESISTIVE WINDING WOUND AROUND A SELECTED ONE OF SAID WINDINGS AND HAVING A NEGLIGIBLE EFFECT ON THE MAGNETIC FIELDS PRODUCED BY SAID PRIMARY AND SECONDARY WINDINGS, SAID RESISTIVE WINDING BEING CONNECTED IN SERIES WITH SAID PRIMARY WINDING, AND (D) A SLOTTED THERMISTOR MOUNTED CLOSE TO SAID WINDINGS AND ELECTRICALLY CONNECTED WITH SAID RESISTIVE WINDING, SAID SLOT BEING FORMED THEREIN TO PREVENT PRODUCTION OF EDDY CURRENTS THEREIN.
Claim 2
Dependent Claim
102 words
A TEMPERATURE-COMPENSATED TRANSFORMER ASSEMBLY COMPRISING: (A) A PRIMARY WINDING ADAPTED TO BE COUPLED TO A SOURCE OF AN EXCITING A.C. VOLTAGE, (B) A SECONDARY WINDING MOUNTED FOR MUTUAL INDUCTIVE COUPLING WITH SAID PRIMARY WINDING, (C) A RESISTIVE WINDING WOUND AROUND A SELECTED ONE OF SAID WINDINGS AND HAVING A NEGLIGIBLE EFFECT ON THE MAGNETIC FIELDS PRODUCED BY SAID PRIMARY AND SECONDARY WINDINGS, SAID RESISTIVE WINDING BEING CONNECTED IN SERIES WITH SAID PRIMARY WINDING, AND (D) A SLOTTED THERMISTOR MOUNTED CLOSE TO SAID WINDINGS AND ELECTRICALLY CONNECTED WITH SAID RESISTIVE WINDING, SAID SLOT BEING FORMED THEREIN TO PREVENT PRODUCTION OF EDDY CURRENTS THEREIN.
References Cited (Backward Citations)
US1279321A
Cited
US2050703A
Cited
US2067604A
Cited
US2229373A
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US2413033A
Cited
US2652521A
Cited
US2743413A
Cited
US2769071A
Cited
US2945933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |