Patent US2642891A successfully refreshed from Google Patents.
US2642891A
Expired / Lapsed
US
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Mercury sealed valve
Assignee: TIDE WATER ASSOCIATED OIL Co
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Filing: 1950-08-22
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Granted: 1953-06-23
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Expires: 1970-08-22
Abstract
No abstract record available.
Inventors
- 👤 Robert D Harrison
- 👤 Harry G Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:51
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/569; F; F16; F16K; F16K13/00; F16K13/08; F16K13/10; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4621; Y10T137/7287; Y10T137/7306
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |