US2438420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibration of cathode-ray oscillographs
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1943-10-09
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Granted: 1948-03-23
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Expires: 1963-10-09
Abstract
No abstract record available.
Inventors
- 👤 Scoles Graham John
- 👤 Miller Charles Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:03
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1908249A
Cited
US2103090A
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US2178074A
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US2232044A
Cited
US2121359A
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US2266668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |