Patent US3287680A successfully refreshed from Google Patents.
US3287680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device
Assignee: Automatic Timing and Controls Inc
•
Filing: 1963-06-18
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Granted: 1966-11-22
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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
2026-10-23 14:43
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.
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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) | 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 |