Patent US2827257A successfully refreshed from Google Patents.
US2827257A
Expired / Lapsed
US
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Gas valve for high vacuum system
Assignee: AT&T Inc
•
Filing: 1954-07-16
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Granted: 1958-03-18
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Becker
- 👤 Raymond G Brandes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:52
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/06; F16K7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US788603A
Cited
AT22032B
Cited
US1024876A
Cited
US1942260A
Cited
US2062335A
Cited
US2586984A
Cited
US2594794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |