Patent US2251618A successfully refreshed from Google Patents.
US2251618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slow opening valve
Assignee: Individual
•
Filing: 1938-09-01
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Granted: 1941-08-05
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Expires: 1958-09-01
Abstract
No abstract record available.
Inventors
- 👤 Rogers Alden
- 👤 Holman K Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:24
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/363; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/1963; Y10T137/1987; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/776; Y10T137/7781; Y10T137/7793; Y10T137/7805
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) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |