US2748798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure check valves
Assignee: Individual
•
Filing: 1952-01-07
•
Granted: 1956-06-05
•
Expires: 1972-01-07
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Withrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/021; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1004654A
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US1236056A
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US1953443A
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DE676680C
Cited
US2179144A
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US2234932A
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US2614888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |