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US2890407A
Expired / Lapsed
US
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Armature testing device
Assignee: Individual
•
Filing: 1955-11-29
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Granted: 1959-06-09
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Expires: 1975-11-29
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Huehn
- 👤 Elmer C Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:56
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/346; H; H02; H02K; H02K15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |