Patent US2633740A successfully refreshed from Google Patents.
US2633740A
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US
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Leakage testing method
Assignee: Individual
•
Filing: 1945-04-26
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Granted: 1953-04-07
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Expires: 1965-04-26
Abstract
No abstract record available.
Inventors
- 👤 John P Howe
- 👤 Alden B Greninger
- 👤 Robert F Plott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:52
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1590736A
Cited
US1378215A
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US1370437A
Cited
US1950304A
Cited
US2055568A
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US2296852A
Cited
GB537588A
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US2407945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |