US2953739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable inductor
Assignee: US Philips Corp
•
Filing: 1956-04-02
•
Granted: 1960-09-20
•
Expires: 1976-04-02
Abstract
No abstract record available.
Inventors
- 👤 Duinker Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/08; H03C1/10; H01; H01F; H01F21/00; H01F21/02; H01F21/08; H03H; H03H5/00; H03H5/12
Claims Analysis
Total Claims: 0
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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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |