US2431057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowdown device
Assignee: Clarcor Inc
•
Filing: 1944-08-25
•
Granted: 1947-11-18
•
Expires: 1964-08-25
Abstract
No abstract record available.
Inventors
- 👤 John L Mainwaring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:51
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/48; F22B37/54; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8275
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2313149A
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US963842A
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US1573786A
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US1825378A
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US1746055A
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US2061852A
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FR821893A
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CH202038A
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US2225838A
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US2324389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |