Patent US3072627A successfully refreshed from Google Patents.
US3072627A
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Polymerization with a catalyst of an alkali metal chromate on silicaalumina
Assignee: Phillips Petroleum Co
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Filing: 1956-03-12
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Granted: 1963-01-08
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Expires: 1976-03-12
Abstract
No abstract record available.
Inventors
- 👤 Vernon C F Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:23
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/10; C08; C08F; C08F10/00; C07C2521/00; C07C2521/12; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/16; C07C2523/24; C07C2523/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD FOR POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE WITH A CATALYST OBTAINED BY DEPOSITING AN ALKALI METAL CHROMATE ON SILICA-ALUMINA AND HEATING AT A TEMPERATURE IN THE RANGE OF 450 TO 1500* F. IN A NON-REDUCING ATMOSPHERE FOR A TIME SUFFICIENT TO ACTIVATE SAID CATALYST FOR SAID METHOD.
Claim 2
Independent Claim
49 words
A METHOD FOR POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE WITH A CATALYST OBTAINED BY DEPOSITING AN ALKALI METAL CHROMATE ON SILICA-ALUMINA AND HEATING AT A TEMPERATURE IN THE RANGE OF 450 TO 1500* F. IN A NON-REDUCING ATMOSPHERE FOR A TIME SUFFICIENT TO ACTIVATE SAID CATALYST FOR SAID METHOD.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |