Patent US2251984A successfully refreshed from Google Patents.
US2251984A
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US
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Oscillograph scale system
Assignee: International Standard Electric Corp
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Filing: 1938-05-21
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Granted: 1941-08-12
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Expires: 1958-05-21
Abstract
No abstract record available.
Inventors
- 👤 Cleaver Richard Francis
- 👤 James Ivor Reginald John
- 👤 Wagstaffe Charles Freder Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/202; Y; Y10; Y10S; Y10S116/00; Y10S116/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-08-11 | 1945-02-10 | 1945-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-11 | 1949-02-10 | 1949-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-11 | 1953-02-10 | 1953-08-12 | $7700.00 | Window Closed / Lapsed |