US3478403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making seat ring for plug valve
Assignee: Rockwell Manufacturing Co
•
Filing: 1968-03-13
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Granted: 1969-11-18
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Expires: 1988-03-13
Abstract
No abstract record available.
Inventors
- 👤 Adolph Wolfensperger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/22; F16K5/227; F16K5/14; F16K5/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49426; Y10T29/49995
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1960385A
Cited
US3042066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |