Patent US2722567A successfully refreshed from Google Patents.
US2722567A
Expired / Lapsed
US
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Electronic tube switching system
Assignee: Automatic Telephone and Electric Co Ltd
•
Filing: 1952-01-08
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Granted: 1955-11-01
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Expires: 1972-01-08
Abstract
No abstract record available.
Inventors
- 👤 Davison Alan
- 👤 Threadgold Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:14
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/525
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2287881A
Cited
US2594389A
Cited
US2542672A
Cited
US2562100A
Cited
US2532718A
Cited
US2578701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |