US2421560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential voltage control system
Assignee: RCA Corp
•
Filing: 1943-09-03
•
Granted: 1947-06-03
•
Expires: 1963-09-03
Abstract
No abstract record available.
Inventors
- 👤 Harold E Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:42
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/02; G01R19/00; G01R19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2203689A
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US2191997A
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US2316240A
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US2335163A
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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) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |