Patent US3146223A successfully refreshed from Google Patents.
US3146223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization in the presence of controlled amounts of hydrogen
Assignee: Shell USA Inc
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Filing: 1959-08-21
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Granted: 1964-08-25
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Expires: 1979-08-21
Abstract
No abstract record available.
Inventors
- 👤 Harry A Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:45
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD OF PRODUCING A POLYOLEFIN OF CLOSELY CONTROLLED MOLECULAR WEIGHT WHICH COMPRISES CONTACTING AN OLEFIN-CONTAINING GAS IN LIQUID PHASE IN THE PRESENCE OF A HYDROCARBON SOLVENT WITH A LOW PRESSURE POLYMERIZATION CATALYST, MAINTAINING IN CONTACT WITH SID REACTION MASS A PREDETERMINED PARTIAL PRESSURE OF HYDROGEN GAS IN THE RANGE FROM 0.002 TO 0.4 ATM., CONTINUOUSLY WITHDRAWING FROM THE REACTION MASS A STREAM CONTAINING HYDROGEN AND RECYCLING THE GASEOUS PORTION THEREOF TO SAID REACTION
Claim 2
Independent Claim
74 words
A METHOD OF PRODUCING A POLYOLEFIN OF CLOSELY CONTROLLED MOLECULAR WEIGHT WHICH COMPRISES CONTACTING AN OLEFIN-CONTAINING GAS IN LIQUID PHASE IN THE PRESENCE OF A HYDROCARBON SOLVENT WITH A LOW PRESSURE POLYMERIZATION CATALYST, MAINTAINING IN CONTACT WITH SID REACTION MASS A PREDETERMINED PARTIAL PRESSURE OF HYDROGEN GAS IN THE RANGE FROM 0.002 TO 0.4 ATM., CONTINUOUSLY WITHDRAWING FROM THE REACTION MASS A STREAM CONTAINING HYDROGEN AND RECYCLING THE GASEOUS PORTION THEREOF TO SAID REACTION
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |