Patent US3890653A successfully refreshed from Google Patents.
US2617291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube testing apparatus
Assignee: United Engineering and Foundry Co
•
Filing: 1947-10-25
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Granted: 1952-11-11
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Expires: 1967-10-25
Abstract
No abstract record available.
Inventors
- 👤 Herman E Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:58
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2846
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1613150A
Cited
US1841974A
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US1972630A
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US2183974A
Cited
US2293471A
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US2196317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |