US3056772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of 1-olefin polymers by precipitation
Assignee: Phillips Petroleum Co
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Filing: 1958-02-03
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Granted: 1962-10-02
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Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 Robert G Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:32
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A PROCESS FOR RECOVERING A NORMALLY SOLID POLYMER OF ETHYLENE FROM HYDROCARBON SOLUTION THEREOF, SAID PROCESS COMPRISING COOLING SAID SOLUTION TO PRECIPITATE SAID POLYMER BY MIXING AND SOLUTION WITH WATER HAVING A TEMPERATURE BELOW THAT AT WHICH SAID POLYMER PRECIPITATES AS A SOLID, UNDER PRESSURE TO MAINTAIN THE HYDROCARBON SOLVENT AND WATER SUBSTANTIALLY IN LIQUID PHASE, MAINTAINING SAID HYDROCARBON AND SAID WATER LIQUID PHASE WITHOUT VARPORIZATION UNTIL SAID POLYMER PRECIPITATES IN SOLID FORM, AND THEREATER VARPORIZING SAID SOLVENT.
References Cited (Backward Citations)
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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) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |