Patent FR524826A successfully refreshed from Google Patents.
Patent US2520092A successfully refreshed from Google Patents.
US2520092A
Expired / Lapsed
US
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Valve
Assignee: Crane Co
•
Filing: 1944-05-15
•
Granted: 1950-08-22
•
Expires: 1964-05-15
Abstract
No abstract record available.
Inventors
- 👤 Edward A Fredrickson
- 👤 Bolling Carl
- 👤 Roy H Zinkil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
F; F16; F16K; F16K41/00; F16K41/02; F16K1/00; F16K1/32; F16K1/34; F16K1/42; F16K1/422; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7043; Y10T137/7062; Y10T137/7504; Y10T137/7613
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US802490A
Cited
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US1424094A
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US1582511A
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US1579272A
Cited
US1566273A
Cited
GB320744A
Cited
US1833653A
Cited
US1884207A
Cited
GB390444A
Cited
US1988966A
Cited
US2039638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |