US3560904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric coils
Assignee: ROLAMITE Tech Inc
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Filing: 1968-04-19
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Granted: 1971-02-02
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Expires: 1988-04-19
Abstract
Abstract AN ELECTRIC COIL IN WHICH THE TURNS OF THE CONDUCTOR ARE WOUND IN MULTIPLES, RATHER THAN IN SINGLE STRANDS. THE CONDUCTOR IS PRINTED OR OTHERWISE PROVIDED ON A WEB OF INSULATING MATERIAL. THE CONDUCTOR IS RANGED IN A SPIRAL PATTERN AROUND A CENTRAL OPENING IN THE WEB. THE WEB ON OPPOSITE SIDES OF THE OPENING IS WOUND IN OPPOSITE DIRECTIONS SO THAT THE FLUX PRODUCED BY CURRENT IN THE CONDUC- TOR IS ADDITIVE WHEN THE WINDINGS HAVE A COMMON CENTRAL AXIS.
Inventors
- 👤 Donald F Wilkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:41
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/041; H01B; H01B7/00; H01B7/08; H01F27/00; H01F27/28; H01F27/2804; H01F17/00; H01F17/0006; H01F2017/006; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49117; Y10T29/49124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |