US2561727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning of electrical resonators
Assignee: Individual
•
Filing: 1943-07-07
•
Granted: 1951-07-24
•
Expires: 1963-07-07
Abstract
No abstract record available.
Inventors
- 👤 Harold G Cooper
- 👤 Howard L Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:08
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2287845A
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US2306860A
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US2289846A
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US2284405A
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US2409640A
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US2416080A
Cited
US2443907A
Cited
US2443908A
Cited
US2432989A
Cited
US2429811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |