Patent US5188976A successfully refreshed from Google Patents.
US2843641A
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Polymerization process for producing heavy propylene polymers
Assignee: California Research LLC
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Filing: 1956-01-03
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Granted: 1958-07-15
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Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Langlois
- 👤 Paul E Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:48
CPC Classifications
A; A01; A01G; A01G25/00; A01G25/16; A01G25/167; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2521/00; C07C2521/06; C07C2521/08; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR PRODUCING PROPYLENE POLYMERS BOILING PREDOMINANTLY IN THE RANGE OF FROM ABOUT 425* TO 650* F., WHICH COMPRISES INTIMATELY CONTACTING A PROPYLENECONTAINING, NORMALLY GASEOUS HYDROCARBON FEED AND A NORMALLY LIQUID POLYMER MATERIAL COMPOSED PREDOMINANTLY OF PROPYLENE TETRAMER WITH LIQUID PHOSPHORIC ACID OF A CONCENTRATION OF FROM ABOUT 110 TO 122%, CALULATED AS ORTHO-PHOSPHORIC ACID, AT A TEMPERATURE OF FROM ABOUT 175* TO 325*F., A PRESSURE OF FROM ABUT 200 TO 1800 P. S. I. G., AND A LIQUID POLYMER/PROPYLENE WEIGHT RATIO OF FROM ABOUT 3 TO 20.
Claim 2
Dependent Claim
89 words
A PROCESS FOR PRODUCING PROPYLENE POLYMERS BOILING PREDOMINANTLY IN THE RANGE OF FROM ABOUT 425* TO 650* F., WHICH COMPRISES INTIMATELY CONTACTING A PROPYLENECONTAINING, NORMALLY GASEOUS HYDROCARBON FEED AND A NORMALLY LIQUID POLYMER MATERIAL COMPOSED PREDOMINANTLY OF PROPYLENE TETRAMER WITH LIQUID PHOSPHORIC ACID OF A CONCENTRATION OF FROM ABOUT 110 TO 122%, CALULATED AS ORTHO-PHOSPHORIC ACID, AT A TEMPERATURE OF FROM ABOUT 175* TO 325*F., A PRESSURE OF FROM ABUT 200 TO 1800 P. S. I. G., AND A LIQUID POLYMER/PROPYLENE WEIGHT RATIO OF FROM ABOUT 3 TO 20.
References Cited (Backward Citations)
US2622113A
Cited
US2592428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |