US2831500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined relief and check valve construction
Assignee: Crane Co
•
Filing: 1954-10-01
•
Granted: 1958-04-22
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Expires: 1974-10-01
Abstract
No abstract record available.
Inventors
- 👤 Fennema Richard
- 👤 Edward W Carr
- 👤 George E Hansen
- 👤 Robert F Daehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:22
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/168; F16K15/00; F16K15/02; F16K15/04; F16K15/044; F16K15/18; F16K15/182; F16K15/1823; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7876; Y10T137/7904; Y10T137/7922; Y10T137/7927; Y10T137/7928; Y10T137/7929; Y10T137/7931; Y10T137/8593; Y10T137/87917; Y10T137/87925; Y10T137/87965; Y10T137/88046; Y10T137/88054; Y10T137/88062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US415469A
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DE541310C
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US2271031A
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US2415258A
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US2466972A
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US2608992A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |