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
2026-10-26 14:08
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/143; H; H03; H03K; H03K12/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1633100A
Cited
US2077196A
Cited
US2063610A
Cited
US2438343A
Cited
US2412350A
Cited
US2378395A
Cited
US2426778A
Cited
US2441246A
Cited
US2434057A
Cited
US2436663A
Cited
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 |