Patent US2663290A successfully refreshed from Google Patents.
US2663290A
Expired / Lapsed
US
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Rotary valve
Assignee: Individual
•
Filing: 1948-03-31
•
Granted: 1953-12-22
•
Expires: 1968-03-31
Abstract
No abstract record available.
Inventors
- 👤 Walder Robert Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
F; F01; F01L; F01L7/00; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1015116A
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US1461296A
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US1614890A
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US2029438A
Cited
US2111597A
Cited
US2146528A
Cited
GB540067A
Cited
US2305874A
Cited
US2374191A
Cited
US2364658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |