Patent US3447222A successfully refreshed from Google Patents.
US3447222A
Expired / Lapsed
US
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Method of fabricating gate valve
Assignee: Dillingham Corp
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Filing: 1967-05-31
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Granted: 1969-06-03
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Expires: 1987-05-31
Abstract
No abstract record available.
Inventors
- 👤 Russell W Bunch
- 👤 Richard C Cousins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:54
CPC Classifications
B; B21; B21D; B21D53/00; F; F16; F16K; F16K27/00; F16K27/04; F16K27/044; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412; Y10T29/49414; Y10T29/49826; Y10T29/49893
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3224729A
Cited
US3066631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |