US2837504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation and recovery of polymers
Assignee: Phillips Petroleum Co
•
Filing: 1955-05-23
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Granted: 1958-06-03
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Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 George E Hanson
- 👤 Leo B Croley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:45
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR FRACTIONATING A NORMALLY SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYMERS AND COPOLYMERS OF 1-OLEFINS HAVING A MAXIMUM CHAIN LENGTH OF 8 CARBON ATOMS AND NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4 POSITION, TO OBTAIN AT LEAST TWO FRACTIONS WHICH DIFER FROM EACH OTHER IN PHYSICAL PROPERTIES, WHICH COMPRISES HEATING A SOLUTION OF SAID POLYMER IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF NORMALLY LIQUID PARAFFINS AND NAPHTHENES TO A TEMPERATURE AT WHICH A POLYMER-RICH PHASE SEPARATES FROM A SOLVENT-RICH PHASE AND SEPARATING SAID PHASES.
Claim 2
Dependent Claim
92 words
A PROCESS FOR FRACTIONATING A NORMALLY SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYMERS AND COPOLYMERS OF 1-OLEFINS HAVING A MAXIMUM CHAIN LENGTH OF 8 CARBON ATOMS AND NO BRANCHING NEARER THE DOUBLE BOND THAN THE 4 POSITION, TO OBTAIN AT LEAST TWO FRACTIONS WHICH DIFER FROM EACH OTHER IN PHYSICAL PROPERTIES, WHICH COMPRISES HEATING A SOLUTION OF SAID POLYMER IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF NORMALLY LIQUID PARAFFINS AND NAPHTHENES TO A TEMPERATURE AT WHICH A POLYMER-RICH PHASE SEPARATES FROM A SOLVENT-RICH PHASE AND SEPARATING SAID PHASES.
References Cited (Backward Citations)
US2529260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |