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US2718780A
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US
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Automatic pressure control and leakage detector
Assignee: AT&T Inc
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Filing: 1951-07-11
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Granted: 1955-09-27
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Expires: 1971-07-11
Abstract
No abstract record available.
Inventors
- 👤 Irving T Swain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:10
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3236; G01M3/3272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1461700A
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US1933322A
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US1900918A
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US2082325A
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US2230961A
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US2387743A
Cited
US2520624A
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FR978221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |