US3028874A
Expired / Lapsed
US
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Valve
Assignee: Dow Chemical Co
•
Filing: 1959-11-02
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Granted: 1962-04-10
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Expires: 1979-11-02
Abstract
No abstract record available.
Inventors
- 👤 Francis L Burkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/30; B22D39/00; B22D41/00; B22D41/14; B22D41/50; B22D41/60; F; F16; F16K; F16K25/00; F16K25/04; F16K49/00; F16K49/002; F16K51/00; F16K51/02; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |