Patent US2231659A successfully refreshed from Google Patents.
Patent US3498317A successfully refreshed from Google Patents.
US3498317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug valves having relieved high pressure seal areas
Assignee: Flowserve Corp
•
Filing: 1968-03-22
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Granted: 1970-03-03
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Expires: 1988-03-22
Abstract
No abstract record available.
Inventors
- 👤 Donn W Duffey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:44
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/0257; F16K5/0271; F16K5/08; F16K5/14; F16K5/16; F16K5/162; F16K5/163; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036; Y10T137/8593; Y10T137/86493; Y10T137/86863; Y10T137/86871
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2728550A
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US2911187A
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US3066909A
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US3133722A
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US3199835A
Cited
US3061269A
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US3276739A
Cited
US3310278A
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US3438388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |