US3138772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical differential transformers
Assignee: Automatic Timing and Controls Inc
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Filing: 1959-05-28
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Granted: 1964-06-23
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Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert W Persons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
A DIFFERENTIAL TRANSFORMER COMPRISING, IN COMBINATION, A LONG CYLINDRICAL WINDING, AN AXIALLY MOVABLE CORE OF MAGNETICALLY PERMEABLE MATERIAL CONTAINED WITHIN SAID WINDING, AND ONLY TWO SHORTER WINDINGS IN BUCKING RELATION TO ONE ANOTHER AND CONCENTRIC WITH SAID LONG WINDING, SAID TWO WINDINGS HAVING RESPECTIVE PREDETERMINED NUMBERS OF TURNS THEREON WHICH INCREASES OUTWARDLY FROM THE CENTER TOWARD OPPOSITE ENDS OF SAID TRANSFORMER TO PROVIDE, WHEN SAID LONG WINDING IS EXCITED, A PREDETERMINED OUTPUT FROM SAID SHORTER WINDINGS AS A FUNCTION OF CORE POSITION, SAID LONG AND SHORTER WINDINGS OF SAID TRANSFORMER BEING SYMMETRICAL WITH RESPECT TO A PLANE PERPENDICULAR TO AND BISECTING THE AXIS OF SAID LONG WINDING.
References Cited (Backward Citations)
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US2911632A
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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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |