Patent US2747594A successfully refreshed from Google Patents.
US2747594A
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Combination safety pressure and vacuum release device
Assignee: Black Sivalls and Bryson Inc
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Filing: 1954-07-20
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Granted: 1956-05-29
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Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 John H Boetjer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:53
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; F16K17/02; F16K17/14; F16K17/16; F16K17/162; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1789; Y10T137/7722; Y10T137/7771; Y10T137/778
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |