Patent US2787281A successfully refreshed from Google Patents.
US2787281A
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US
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Proportioning of fluids
Assignee: Phillips Petroleum Co
•
Filing: 1953-03-25
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Granted: 1957-04-02
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Expires: 1973-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr James C Word
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:38
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |