US2851534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telecommunication exchange system
Assignee: International Standard Electric Corp
•
Filing: 1952-03-18
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Granted: 1958-09-09
•
Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Bray Frederick Harry
- 👤 Butler Michael Arthu Edgeworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:55
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/68; H04Q3/52; H04Q3/521; H01; H01J; H01J2893/00; H01J2893/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2241031A
Cited
US2299514A
Cited
US2298699A
Cited
US2502415A
Cited
US2570971A
Cited
US2567115A
Cited
US2603716A
Cited
US2714179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |