Patent US3154530A successfully refreshed from Google Patents.
US3154530A
Expired / Lapsed
US
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Preparation of polyethylene powders
Assignee: Union Carbide Corp
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Filing: 1960-02-29
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Granted: 1964-10-27
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Expires: 1980-02-29
Abstract
No abstract record available.
Inventors
- 👤 Theodore E Mullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:29
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
METHOD FOR PREPARING POLYETHYLENE POWDERS WHICH INCLUDES THE STEPS OF ADDING TO A SOLUTION OF A POLYETHYLENE HAVING A MELT INDEX ABOVE ABOUT 0.005 IN AN INERT LIQUID ORGANIC SOLVENT A LIQUID NONSOLVENT FOR SAID POLYETHYLENE WHICH IS IMMISCIBLE WITH SAID INERT LIQUID ORGANIC SOLVENT, AGITATING THE SOLUTION AND NONSOLVENT TO FORM A DISPERSION COMPRISING GLOBULES OF SAID SOLUTION IN THE LIQUID NONSOLVENT, COOLING THE DISPERSION TO PRECIPITATE SAID POLYETHYLENE FROM SOLUTION IN THE ABSENCE OF TURBULENCE IN THE FORM OF ULTIMATE PARTICLES SUSPENDED IN SAID GLOBULES, SEPARATING THE INERT LIQUID ORGANIC SOLVENT AND SAID ULTIMATE PARTICES, THEREBY AGGREGATING SAID ULTIMATE PARTICLES INTO GRANULES LESS THAN ABOUT 7,000 MICRONS IN AVERAGE DIAMETER, GRINDING THE RESULTING FRIABLE GRANULES UNTIL AT LEAST 95 PERCENT BY WEIGHT THEREOF HAVE A PARTICLE SIZE BETWEEN ABOUT 50 AND 500 MICRONS.
Claim 2
Dependent Claim
135 words
METHOD FOR PREPARING POLYETHYLENE POWDERS WHICH INCLUDES THE STEPS OF ADDING TO A SOLUTION OF A POLYETHYLENE HAVING A MELT INDEX ABOVE ABOUT 0.005 IN AN INERT LIQUID ORGANIC SOLVENT A LIQUID NONSOLVENT FOR SAID POLYETHYLENE WHICH IS IMMISCIBLE WITH SAID INERT LIQUID ORGANIC SOLVENT, AGITATING THE SOLUTION AND NONSOLVENT TO FORM A DISPERSION COMPRISING GLOBULES OF SAID SOLUTION IN THE LIQUID NONSOLVENT, COOLING THE DISPERSION TO PRECIPITATE SAID POLYETHYLENE FROM SOLUTION IN THE ABSENCE OF TURBULENCE IN THE FORM OF ULTIMATE PARTICLES SUSPENDED IN SAID GLOBULES, SEPARATING THE INERT LIQUID ORGANIC SOLVENT AND SAID ULTIMATE PARTICES, THEREBY AGGREGATING SAID ULTIMATE PARTICLES INTO GRANULES LESS THAN ABOUT 7,000 MICRONS IN AVERAGE DIAMETER, GRINDING THE RESULTING FRIABLE GRANULES UNTIL AT LEAST 95 PERCENT BY WEIGHT THEREOF HAVE A PARTICLE SIZE BETWEEN ABOUT 50 AND 500 MICRONS.
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |