US2433343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichannel electrical communication system
Assignee: International Standard Electric Corp
•
Filing: 1943-02-16
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Granted: 1947-12-30
•
Expires: 1963-02-16
Abstract
No abstract record available.
Inventors
- 👤 Chatterjea Prafulla Kumar
- 👤 Houghton Leslie Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:38
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1447204A
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US1461064A
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FR733626A
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US1854986A
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US1851721A
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US2037799A
Cited
US1985046A
Cited
US2226459A
Cited
US2266526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |