Patent US2680779A successfully refreshed from Google Patents.
US2680779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication compensation system for atmospheric pressure variation
Assignee: RCA Corp
•
Filing: 1949-05-06
•
Granted: 1954-06-08
•
Expires: 1969-05-06
Abstract
No abstract record available.
Inventors
- 👤 Leslie J Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:20
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1887739A
Cited
US2142857A
Cited
US2155419A
Cited
US2231570A
Cited
US2378227A
Cited
US2392218A
Cited
US2491390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |