US2489297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic pulse filtering system
Assignee: STC PLC
•
Filing: 1943-05-24
•
Granted: 1949-11-29
•
Expires: 1963-05-24
Abstract
No abstract record available.
Inventors
- 👤 Labin Emile
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:23
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1483172A
Cited
US2132655A
Cited
US2151149A
Cited
US2211942A
Cited
US2284714A
Cited
US2231792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |