US2880400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductor
Assignee: Collins Radio Co
•
Filing: 1953-07-01
•
Granted: 1959-03-31
•
Expires: 1973-07-01
Abstract
No abstract record available.
Inventors
- 👤 Robert D Tollefson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1619597A
Cited
FR747762A
Cited
US2497854A
Cited
US2410222A
Cited
GB604652A
Cited
US2521963A
Cited
US2475637A
Cited
GB658637A
Cited
US2655590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |