US2436640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the frequency modulation of the resonant frequency of cavity resonators
Assignee: NILS GEORG SCHONANDER
•
Filing: 1943-11-24
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Granted: 1948-02-24
•
Expires: 1963-11-24
Abstract
No abstract record available.
Inventors
- 👤 Fredholm Johan Olof Helge
- 👤 Claesson Per Harry Elias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/12; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 0
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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) | 1951-02-23 | 1951-08-25 | 1952-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-23 | 1955-08-25 | 1956-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-23 | 1959-08-25 | 1960-02-24 | $7700.00 | Window Closed / Lapsed |