Patent US3073812A successfully refreshed from Google Patents.
US3073812A
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Recovery of olefin polymers from solution
Assignee: Phillips Petroleum Co
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Filing: 1960-01-07
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Granted: 1963-01-15
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Expires: 1980-01-07
Abstract
No abstract record available.
Inventors
- 👤 Eulas W Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:29
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR RECOVERING, FROM A SOLUTION OF A SOLID POLYMER OF A 1-OLEFIN HAVING A MAXIMUM OF 8 CARBON ATOMS PER MOLECULE AND NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4-POSITION, A SOLID PRODUCT, WHICH PROCESS COMPRISES INTRODUCING SAID SOLUTION INTO A PRECIPITATION ZONE; REMOVING THE HEAT FROM THE SOLUTION AT A SUBSTANTIALLY UNIFORM RATE, THEREBY PRECIPITATING THE POLYMER AND FORMING A SLURRY OF POLYMER IN SOLVENT; THEREAFTER INTRODUCING SAID SLURRY TO A SEPARATION ZONE AND SEPARATING SAID PRECIPITATED POLYMER AND SOLVENT TO OBTAIN FRACTIONS OF PRECIPITATED POLYMER CONCENTRATED AS TO POLYMER PARTICLE SIZE; THEREAFTER RECYCLING A FRACTION CONCENTRATED IN SMALL PARTICLES OF POLYMER TO THE PRECIPITATION ZONE AND RECOVERING THE PRODUCT IN A PRODUCT RECOVERY ZONE.
Claim 2
Dependent Claim
119 words
A PROCESS FOR RECOVERING, FROM A SOLUTION OF A SOLID POLYMER OF A 1-OLEFIN HAVING A MAXIMUM OF 8 CARBON ATOMS PER MOLECULE AND NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4-POSITION, A SOLID PRODUCT, WHICH PROCESS COMPRISES INTRODUCING SAID SOLUTION INTO A PRECIPITATION ZONE; REMOVING THE HEAT FROM THE SOLUTION AT A SUBSTANTIALLY UNIFORM RATE, THEREBY PRECIPITATING THE POLYMER AND FORMING A SLURRY OF POLYMER IN SOLVENT; THEREAFTER INTRODUCING SAID SLURRY TO A SEPARATION ZONE AND SEPARATING SAID PRECIPITATED POLYMER AND SOLVENT TO OBTAIN FRACTIONS OF PRECIPITATED POLYMER CONCENTRATED AS TO POLYMER PARTICLE SIZE; THEREAFTER RECYCLING A FRACTION CONCENTRATED IN SMALL PARTICLES OF POLYMER TO THE PRECIPITATION ZONE AND RECOVERING THE PRODUCT IN A PRODUCT RECOVERY ZONE.
References Cited (Backward Citations)
US2388160A
Cited
US2858902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |