US2727094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operating selecting systems
Assignee: Post Office
•
Filing: 1951-05-07
•
Granted: 1955-12-13
•
Expires: 1971-05-07
Abstract
No abstract record available.
Inventors
- 👤 Flowers Thomas Harold
- 👤 Harper Samuel Denis
- 👤 Harris Lionel Roy Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:52
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H01; H01J; H01J19/00; H01J19/42; H01J19/44; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2379715A
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US2512676A
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US2570274A
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US2638505A
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US2666809A
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US2582959A
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US2619548A
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US2541932A
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US2583711A
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US2632880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |