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US2425495A
Expired / Lapsed
US
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Two-way telephone system
Assignee: RCA Corp
•
Filing: 1943-10-30
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Granted: 1947-08-12
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Expires: 1963-10-30
Abstract
No abstract record available.
Inventors
- 👤 Bertram A Trevor
- 👤 John B Atwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:34
CPC Classifications
H; H04; H04M; H04M11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1857819A
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US2167058A
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US2007399A
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US2059870A
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US2165063A
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US2034565A
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US2206231A
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US2223049A
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US2265056A
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US2289794A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |