US2793830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum release valves
Assignee: Central Scientific Co
•
Filing: 1952-08-25
•
Granted: 1957-05-28
•
Expires: 1972-08-25
Abstract
No abstract record available.
Inventors
- 👤 Edward M Nakaji
- 👤 Harris M Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:20
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/06; Y; Y10; Y10S; Y10S251/00; Y10S251/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1299571A
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US1424559A
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US1534793A
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US2343235A
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US2459668A
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US2537249A
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US2638243A
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US2657825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |