US2640973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signal modulator
Assignee: International Standard Electric Corp
•
Filing: 1949-01-05
•
Granted: 1953-06-02
•
Expires: 1969-01-05
Abstract
No abstract record available.
Inventors
- 👤 Cleaver Richard Francis
- 👤 Gray Thomas Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:31
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/143; H; H03; H03K; H03K12/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1633100A
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US2077196A
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US2063610A
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US2438343A
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US2412350A
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US2441246A
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US2434057A
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US2436663A
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US2494370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |