Patent US2549505A successfully refreshed from Google Patents.
US2549505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase or frequency modulation system
Assignee: AT&T Inc
•
Filing: 1948-09-09
•
Granted: 1951-04-17
•
Expires: 1968-09-09
Abstract
No abstract record available.
Inventors
- 👤 Milton E Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:20
CPC Classifications
H; H03; H03K; H03K7/00; H03C; H03C3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2086918A
Cited
US2272070A
Cited
US2288575A
Cited
US2338395A
Cited
US2408692A
Cited
US2451824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |