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US2880819A
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Recovery and classification of solids
Assignee: Phillips Petroleum Co
•
Filing: 1955-08-03
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Granted: 1959-04-07
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Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 William R King
- 👤 Wilson H Rushford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/487; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1715273A
Cited
GB368731A
Cited
US2318395A
Cited
US2626012A
Cited
US2633206A
Cited
US2779468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |