Patent US2435572A successfully refreshed from Google Patents.
US2468058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking system for multichannel operation
Assignee: STC PLC
•
Filing: 1943-11-23
•
Granted: 1949-04-26
•
Expires: 1963-11-23
Abstract
No abstract record available.
Inventors
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:43
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/087; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1924174A
Cited
USRE21103E
Cited
GB438568A
Cited
US2153202A
Cited
US2181309A
Cited
US2141343A
Cited
GB474690A
Cited
GB480572A
Cited
US2223995A
Cited
US2266401A
Cited
US2262838A
Cited
US2221665A
Cited
US2273193A
Cited
US2212173A
Cited
GB520606A
Cited
US2326584A
Cited
US2255403A
Cited
US2277000A
Cited
US2361437A
Cited
US2406019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |