US3150340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal core for high-q coil
Assignee: Individual
•
Filing: 1958-06-24
•
Granted: 1964-09-22
•
Expires: 1978-06-24
Abstract
No abstract record available.
Inventors
- 👤 David C Kalbfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/06; H01F17/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A TOROIDAL CORE FOR FORMING A HIGH-Q COIL HAVING A HIGH INDUCTANCE PER VOLUME FOR USE AT HIGH FREQUENCIES AND HAVING A Q DEFINED BY THE EXPRESSION
Claim 2
Dependent Claim
27 words
A TOROIDAL CORE FOR FORMING A HIGH-Q COIL HAVING A HIGH INDUCTANCE PER VOLUME FOR USE AT HIGH FREQUENCIES AND HAVING A Q DEFINED BY THE EXPRESSION
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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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |