US2485591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse time division multiplex system
Assignee: STC PLC
•
Filing: 1945-10-30
•
Granted: 1949-10-25
•
Expires: 1965-10-30
Abstract
No abstract record available.
Inventors
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04J3/0614; H04J3/04; H04J3/045; H04J3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256336A
Cited
US2217957A
Cited
US2412974A
Cited
US2401405A
Cited
US2416330A
Cited
US2408077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |