US2419852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the ratio or product of two alternating voltages
Assignee: Geophysical Research Corp
•
Filing: 1944-02-19
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Granted: 1947-04-29
•
Expires: 1964-02-19
Abstract
No abstract record available.
Inventors
- 👤 John E Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:29
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/163; G01; G01R; G01R27/00; G01R27/02; G01R27/08; G01R27/10; G01R27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |