US2201837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief valve
Assignee: Pfaudler Inc
•
Filing: 1939-03-24
•
Granted: 1940-05-21
•
Expires: 1959-03-24
Abstract
No abstract record available.
Inventors
- 👤 Schanck William Dana
- 👤 Cudney Gordon Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:02
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; F16K15/00; F16K15/14; F16K15/144; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7734; Y10T137/7771; Y10T137/7781; Y10T137/7832; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7881
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |