US2555511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable permeability tuning system
Assignee: RCA Corp
•
Filing: 1946-04-09
•
Granted: 1951-06-05
•
Expires: 1966-04-09
Abstract
No abstract record available.
Inventors
- 👤 William F Sands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:17
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/28; H01; H01F; H01F21/00; H01F21/02; H01F21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB278208A
Cited
US2199669A
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GB414707A
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US2141890A
Cited
US2222387A
Cited
GB526464A
Cited
US2297514A
Cited
US2252092A
Cited
US2323376A
Cited
US2340749A
Cited
US2375911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |