Patent US2746478A successfully refreshed from Google Patents.
US2746478A
Expired / Lapsed
US
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Plug valves
Assignee: Rockwell Manufacturing Co
•
Filing: 1951-03-15
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Granted: 1956-05-22
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Expires: 1971-03-15
Abstract
No abstract record available.
Inventors
- 👤 Charles B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:51
CPC Classifications
F; F16; F16K; F16K35/00; F16K35/10; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4393; Y10T137/44; Y10T137/7069; Y10T137/71
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |