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Patent US3245934A successfully refreshed from Google Patents.
US3245934A
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Production of finely divided polyolefin from preformed polymeric gel
Assignee: Pennwalt Corp
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Filing: 1960-12-19
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Granted: 1966-04-12
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Expires: 1980-12-19
Abstract
No abstract record available.
Inventors
- 👤 Krzyszkowski Lescek Jan Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:07
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PRODUCING FINELY DIVIDED POLYOLEFIN POWER WHICH CONSISTS ESSENTIALLY OF THE STEPS OF DISPERSING AND DISTINTEGRATING INTO FIME PARTICLES, BY MEANS OF SHEARING ACTION A PREFORMED GEL CONSISTING OF POLYOLEFIN RESIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND COPOLYMERS OF ETHYLENE AND PROPYLENE WITH OTHER OLEFINS AND A VOLATILE NONPOLAR ORGANIC SOLVENT IN AN AQUEOUS MEDIUM CONTAINING A LOW-SUDSING AMOUNT OF A HYDROPHILIC SURFACTANT HAVING A HYDROPHILE-LIPOPHILE BALANCE VALUE OF AT LEAST 10 AT A TEMPERATURE BELOW THE FUSION POINT OF SAID GEL, LEACHING THE SOLVENT FROM SAID PARTICLES BY MEANS OF SAID MEDIUM, REMOVING THE SOLVENT FROM SAID MEDIUM, AND FILTERING AND MEDIUM TO RECOVER SAID PARTICLES.
Claim 2
Dependent Claim
112 words
A PROCESS FOR PRODUCING FINELY DIVIDED POLYOLEFIN POWER WHICH CONSISTS ESSENTIALLY OF THE STEPS OF DISPERSING AND DISTINTEGRATING INTO FIME PARTICLES, BY MEANS OF SHEARING ACTION A PREFORMED GEL CONSISTING OF POLYOLEFIN RESIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND COPOLYMERS OF ETHYLENE AND PROPYLENE WITH OTHER OLEFINS AND A VOLATILE NONPOLAR ORGANIC SOLVENT IN AN AQUEOUS MEDIUM CONTAINING A LOW-SUDSING AMOUNT OF A HYDROPHILIC SURFACTANT HAVING A HYDROPHILE-LIPOPHILE BALANCE VALUE OF AT LEAST 10 AT A TEMPERATURE BELOW THE FUSION POINT OF SAID GEL, LEACHING THE SOLVENT FROM SAID PARTICLES BY MEANS OF SAID MEDIUM, REMOVING THE SOLVENT FROM SAID MEDIUM, AND FILTERING AND MEDIUM TO RECOVER SAID PARTICLES.
References Cited (Backward Citations)
US2313144A
Cited
US2290794A
Cited
GB571814A
Cited
GB617052A
Cited
US2449489A
Cited
GB721908A
Cited
US3073790A
Cited
BE583896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |