US2981727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of modified polymers by heating to 600-900 deg. f. in the presence of chromium oxide
Assignee: Phillips Petroleum Co
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Filing: 1958-06-26
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Granted: 1961-04-25
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Expires: 1978-06-26
Abstract
No abstract record available.
Inventors
- 👤 Paul J Boeke
- 👤 Jr John N Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:37
CPC Classifications
C; C08; C08F; C08F8/00; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR TREATING A POLYMER OF AN ALIPHATIC 1-OLEFIN CONTAINING UP TO AND INCLUDING 8 CARBON ATOMS PER MOLECULE, SAID POLYMER HAVING A CRYSTALLINITY OF AT LEAST 70 PERCENT AT 25*C., WHICH COMPRISES CONTACTING SAID POLYMER WITH FROM 0.1 TO 5 WEIGHT PERCENT, BASED ON SAID POLYMER, OF A CATALYST COMPRISING CHROMIUM OXIDE, AT LEAST PART OF THE CHROMIUM BEING IN THE HEXAVALENT STATE, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA, SAID CONTACTING OCCURRING AT A TEMPERATURE IN THE RANGE OF 600 TO 900* F. FOR A PERIOD OF TIME OF FROM 0.5 TO 5 MINUTES; AND RECOVERING THE TREATED POLYMER SO PRODUCED.
Claim 2
Dependent Claim
111 words
A PROCESS FOR TREATING A POLYMER OF AN ALIPHATIC 1-OLEFIN CONTAINING UP TO AND INCLUDING 8 CARBON ATOMS PER MOLECULE, SAID POLYMER HAVING A CRYSTALLINITY OF AT LEAST 70 PERCENT AT 25*C., WHICH COMPRISES CONTACTING SAID POLYMER WITH FROM 0.1 TO 5 WEIGHT PERCENT, BASED ON SAID POLYMER, OF A CATALYST COMPRISING CHROMIUM OXIDE, AT LEAST PART OF THE CHROMIUM BEING IN THE HEXAVALENT STATE, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA, SAID CONTACTING OCCURRING AT A TEMPERATURE IN THE RANGE OF 600 TO 900* F. FOR A PERIOD OF TIME OF FROM 0.5 TO 5 MINUTES; AND RECOVERING THE TREATED POLYMER SO PRODUCED.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |