US2513281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line-operated vacuum tube voltmeter
Assignee: United States Department of Agriculture
•
Filing: 1946-01-15
•
Granted: 1950-07-04
•
Expires: 1966-01-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Edmund M Buras
- 👤 Reid John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2188830A
Cited
US2395425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |