Patent US2911475A successfully refreshed from Google Patents.
US2911475A
Expired / Lapsed
US
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Electrical signalling systems
Assignee: International Standard Electric Corp
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Filing: 1954-11-26
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Granted: 1959-11-03
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Bray Frederick Harry
- 👤 Knight Ronald George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:47
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H03; H03K; H03K17/00; H03K17/51; H03K17/52; H03K29/00; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521; H04Q3/525
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |