US2731583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signal measuring apparatus with dynamic null balance
Assignee: Individual
•
Filing: 1951-09-24
•
Granted: 1956-01-17
•
Expires: 1971-09-24
Abstract
No abstract record available.
Inventors
- 👤 Ellis Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:27
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2246575A
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US2248581A
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US2465355A
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US2588114A
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US2489328A
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US2472727A
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US2689932A
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US2540179A
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US2565839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |