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US2458033A
Expired / Lapsed
US
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Microphonics tester
Assignee: Individual
•
Filing: 1943-04-24
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Granted: 1949-01-04
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Expires: 1963-04-24
Abstract
No abstract record available.
Inventors
- 👤 John E Sterner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:36
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/24; G01R31/25; Y; Y10; Y10S; Y10S439/00; Y10S439/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1540355A
Cited
US2278697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |