Patent US2646074A successfully refreshed from Google Patents.
US2646074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable stroke cushioned valve
Assignee: R S PRODUCTS CORP
•
Filing: 1948-07-28
•
Granted: 1953-07-21
•
Expires: 1968-07-28
Abstract
No abstract record available.
Inventors
- 👤 Hopkins David Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:24
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/01; F16K47/011; F16K47/0111
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US444528A
Cited
US454360A
Cited
US531792A
Cited
US846692A
Cited
US1126384A
Cited
US1558590A
Cited
US1998873A
Cited
US2223792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |