US3521428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase separation
Assignee: Phillips Petroleum Co
•
Filing: 1968-06-20
•
Granted: 1970-07-21
•
Expires: 1988-06-20
Abstract
No abstract record available.
Inventors
- 👤 Robert E Dollinger
- 👤 Robert H Kallenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:01
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/487; C01; C01P; C01P2004/00; C01P2004/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA707684A
Cited
US1617071A
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US1601148A
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US1784278A
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US2500851A
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US2805732A
Cited
US2861649A
Cited
US2966232A
Cited
US3146080A
Cited
US3318070A
Cited
US3384460A
Cited
US3411929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |