US2367277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for frequency changing
Assignee: Individual
•
Filing: 1942-02-10
•
Granted: 1945-01-16
•
Expires: 1962-02-10
Abstract
No abstract record available.
Inventors
- 👤 Henroteau Francois Char Plerre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:03
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/66; H04B1/662; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60; H01J31/62; H01J31/64; H04J; H04J3/00; H04J3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-01-16 | 1948-07-17 | 1949-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-01-16 | 1952-07-17 | 1953-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-01-16 | 1956-07-17 | 1957-01-16 | $7700.00 | Window Closed / Lapsed |