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Patent US3391704A successfully refreshed from Google Patents.
US3391704A
Expired / Lapsed
US
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Valve seat having grid-like pattern of slot-forming ribs
Assignee: Dover Corp
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Filing: 1965-12-20
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Granted: 1968-07-09
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Expires: 1985-12-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles J Kremer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:27
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/08; F04; F04B; F04B39/00; F04B39/10; F04B39/1073; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2941544A
Cited
US3109451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |