US2497860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Chicago Bridge and Iron Co
•
Filing: 1945-10-03
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Granted: 1950-02-21
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Expires: 1965-10-03
Abstract
No abstract record available.
Inventors
- 👤 Richard A Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/044; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7734; Y10T137/7837; Y10T137/7876; Y10T137/7877; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/1892; Y10T74/18952; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/20588
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) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |