US2543022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metering circuit control for automatic telephone systems
Assignee: STC PLC
•
Filing: 1945-08-03
•
Granted: 1951-02-27
•
Expires: 1965-08-03
Abstract
No abstract record available.
Inventors
- 👤 Henry L Horwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
H; H04; H04M; H04M15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1862536A
Cited
US1804408A
Cited
US1866597A
Cited
US2072234A
Cited
US2232189A
Cited
US2232181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |