US2870406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for voltage measurement
Assignee: Individual
•
Filing: 1957-06-03
•
Granted: 1959-01-20
•
Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Caldwell P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:34
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/02; G01; G01R; G01R19/00; G01R19/10; G01R19/165; G01R19/17; G01R19/18; H; H03; H03M; H03M1/00; H03M1/12; H03M1/14; H03M1/142; H03M1/50; H03M1/504
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2556200A
Cited
US2701303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |