US2702935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming transformer cores
Assignee: McGraw Electric Co
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Filing: 1951-10-13
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Granted: 1955-03-01
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Expires: 1971-10-13
Abstract
No abstract record available.
Inventors
- 👤 Jr William D Kyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:51
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F27/00; H01F27/24; H01F27/25; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD FOR FORMING A CORE FOR AN ELECTRO-MAGNETIC APPARATUS COMPRISING SPIRALLY WINDING A CONTINUOUS STRIP OF MAGNETIC MATERIAL ON A MANDREL, EXTENDING A PART OF EACH TURN OF SAID SPIRAL BEYOND THE EDGE OF THE PRECEDING TURN, MAINTAINING SAID SPIRAL SO THAT THERE IS NO POSSIBLE MOVEMENT BETWEEN LAYERS, SUBSQUENTLY ANNEALING THE CORE AT A TEMPERATURE SUFFICIENT TO PRODUCE GRAIN GROWTH AND ORIENTATION, WHICH TEMPERATURE CAUSES ADHESIONS BETWEEN LAYERS OF THE STRIP, COLLAPSING SAID CORE FORM UNTIL EACH LAYER IS CONTERMINOUS WITH THE NEXT LAYER, AND MAINTAINING SAID CORE SO THERE IS NO MOVEMENT BETWEEN LAYERS, WHEREBY AN ELECTRO-MAGNETIC CORE IS FORMED WITHOUT ADHESIONS AND THE FORMERLY ADHERED AREAS ARE NON-ADJACENT IN SAID CORE.
Claim 2
Independent Claim
115 words
A METHOD FOR FORMING A CORE FOR AN ELECTRO-MAGNETIC APPARATUS COMPRISING SPIRALLY WINDING A CONTINUOUS STRIP OF MAGNETIC MATERIAL ON A MANDREL, EXTENDING A PART OF EACH TURN OF SAID SPIRAL BEYOND THE EDGE OF THE PRECEDING TURN, MAINTAINING SAID SPIRAL SO THAT THERE IS NO POSSIBLE MOVEMENT BETWEEN LAYERS, SUBSQUENTLY ANNEALING THE CORE AT A TEMPERATURE SUFFICIENT TO PRODUCE GRAIN GROWTH AND ORIENTATION, WHICH TEMPERATURE CAUSES ADHESIONS BETWEEN LAYERS OF THE STRIP, COLLAPSING SAID CORE FORM UNTIL EACH LAYER IS CONTERMINOUS WITH THE NEXT LAYER, AND MAINTAINING SAID CORE SO THERE IS NO MOVEMENT BETWEEN LAYERS, WHEREBY AN ELECTRO-MAGNETIC CORE IS FORMED WITHOUT ADHESIONS AND THE FORMERLY ADHERED AREAS ARE NON-ADJACENT IN SAID CORE.
References Cited (Backward Citations)
US2157050A
Cited
US2260398A
Cited
US2390937A
Cited
US2406130A
Cited
US2387099A
Cited
US2544871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |