US2913442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of propylene
Assignee: Hercules Powder Co
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Filing: 1957-05-27
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Granted: 1959-11-17
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Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Albert S Matlack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:58
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE PROCESS OF POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE AT A TEMPERATURE OF FROM ABOUT -80* C. TO ABOUT 200* C. WITH A CATALYST CONSISTING ESSENTIALLY OF A HYDRIDE OF A GROUP IV-B METAL IN COMBINATION WITH A HYDROGEN HALIDE, SAID METAL HYDRIDE HAVING A PARTICLE SIZE OF FROM ABOUT 1 MICRON TO ABOUT 100 MICRONS AND BEING PRESENT IN AN AMOUNT OF FROM ABOUT 1% TO ABOUT 20% BY WEIGHT BASED ON THE PROPYLENE AND SAID HYDROGEN HALIDE BEING PRESENT IN AN AMOUNT OF FROM ABOUT 0.05% TO ABOUT 5% BY WEIGHT BASED ON THE PROPYLENE.
Claim 2
Dependent Claim
97 words
THE PROCESS OF POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE AT A TEMPERATURE OF FROM ABOUT -80* C. TO ABOUT 200* C. WITH A CATALYST CONSISTING ESSENTIALLY OF A HYDRIDE OF A GROUP IV-B METAL IN COMBINATION WITH A HYDROGEN HALIDE, SAID METAL HYDRIDE HAVING A PARTICLE SIZE OF FROM ABOUT 1 MICRON TO ABOUT 100 MICRONS AND BEING PRESENT IN AN AMOUNT OF FROM ABOUT 1% TO ABOUT 20% BY WEIGHT BASED ON THE PROPYLENE AND SAID HYDROGEN HALIDE BEING PRESENT IN AN AMOUNT OF FROM ABOUT 0.05% TO ABOUT 5% BY WEIGHT BASED ON THE PROPYLENE.
References Cited (Backward Citations)
US2461951A
Cited
US2685575A
Cited
US2725374A
Cited
BE538782A
Cited
FR1135599A
Cited
US2846427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |