US3559144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically-switchable variable resistance network
Assignee: Thorn Electronics Ltd
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Filing: 1969-09-22
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Granted: 1971-01-26
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Expires: 1989-09-22
Abstract
Abstract A VOLTAGE GENERATOR VARIABLE BY STEPS IN RESPONSE TO ROTATION OF A MANUALLY-OPERABLE CONTROL MEMBER, WHICH CONNECTS TO VARIOUS TAPS ON A VOLTAGE DIVIDED THROUGH SUITABLE CURRENT-LIMITING RESISTORS BY MEANS OF A MAGNETICALLY-OPERABLE SWITCH, THE LATTER OPERATING ON ONE VOLTAGE DIVIDER UNIT WHEN ON A SINGLE CONTACT AND ON TWO ADJACENT UNITS WHEN BETWEEN CONTACTS.
Inventors
- 👤 Anthony Leonard Isaacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:09
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/06; H01H; H01H36/00; H01H36/0006; H01H36/006; H05; H05B; H05B39/00; H05B39/04; H05B39/041; Y; Y02; Y02B; Y02B20/00
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |