US2581780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for phase and frequency modulation
Assignee: Individual
•
Filing: 1946-10-15
•
Granted: 1952-01-08
•
Expires: 1966-10-15
Abstract
No abstract record available.
Inventors
- 👤 Ahier Georges Charles
- 👤 Buffet Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:05
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2248870A
Cited
US1864638A
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GB252387A
Cited
US1933735A
Cited
US2210015A
Cited
US2263902A
Cited
US2408816A
Cited
US2483768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |