US2691297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing leaky receptacles
Assignee: AT&T Inc
•
Filing: 1951-07-11
•
Granted: 1954-10-12
•
Expires: 1971-07-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Kreisel
- 👤 Robert E Polk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:14
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3236; G01M3/3263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1537270A
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US1589825A
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US1684014A
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US1720934A
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US1812152A
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US2395536A
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US2589251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |