US3136948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D. c. instrument transformer system
Assignee: Individual
•
Filing: 1961-02-21
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Granted: 1964-06-09
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Expires: 1981-02-21
Abstract
No abstract record available.
Inventors
- 👤 Alfred A Windsor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:25
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18; G01R19/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A D.C. MEASURING INSTRUMENT, THE COMBINATION COMPRISING A FIRST AND A SECOND TRANSFORMER EACH HAVING A CORE CHARACTERIZED BY A RECTANGULAR HYSTERESIS LOOP, SAID TRANSFORMERS HAVING PRIMARY WINDINGS CONNECTED IN SERIES AND ADAPTED FOR CONDUCTING THE CURRENT TO BE MEASURED, SAID TRANSFORMERS HAVING SECONDARY WINDINGS EACH HAVING A FIRST AND A SECOND END, SAID FIRST TRANSFORMER SECONDARY HAVING SAID SECOND END THEREOF CONNECTED TO SAID FIRST END OF SAID SECOND TRANSFORMER SECONDARY, A THIRD SOURCE TRANSFORMER HAVING A PRIMARY WINDING ADAPTED FOR CONNECTION WITH AN ALTERNATING CURRENT SOURCE AND HAVING A SECONDARY WINDING, A FIRST DIODE CONNECTED IN SERIES WITH SAID SECOND-
Claim 2
Dependent Claim
103 words
IN A D.C. MEASURING INSTRUMENT, THE COMBINATION COMPRISING A FIRST AND A SECOND TRANSFORMER EACH HAVING A CORE CHARACTERIZED BY A RECTANGULAR HYSTERESIS LOOP, SAID TRANSFORMERS HAVING PRIMARY WINDINGS CONNECTED IN SERIES AND ADAPTED FOR CONDUCTING THE CURRENT TO BE MEASURED, SAID TRANSFORMERS HAVING SECONDARY WINDINGS EACH HAVING A FIRST AND A SECOND END, SAID FIRST TRANSFORMER SECONDARY HAVING SAID SECOND END THEREOF CONNECTED TO SAID FIRST END OF SAID SECOND TRANSFORMER SECONDARY, A THIRD SOURCE TRANSFORMER HAVING A PRIMARY WINDING ADAPTED FOR CONNECTION WITH AN ALTERNATING CURRENT SOURCE AND HAVING A SECONDARY WINDING, A FIRST DIODE CONNECTED IN SERIES WITH SAID SECOND-
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |