US2979496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature polymerization of ethylene
Assignee: Monsanto Chemicals Ltd
•
Filing: 1958-02-26
•
Granted: 1961-04-11
•
Expires: 1978-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ehrlich Paul
- 👤 Robert N Pittilo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:09
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A PROCESS FOR THE POLYMERIZATION OF ETHYLENE TO SOLID POLYMERS WHICH COMPRISES (1) PREPARING AN ETHYLENE POLYMERIZATION CATALYST BY CONTACTING OXYGEN WITH ETHYLENE IN A PROPORTION OF FROM 50 TO 10,000 PARTS BY WEIGHT OF OXYGEN PER MILLION PARTS BY WEIGHT OF ETHYLENE AT A PRESSURE BELOW THE CRITICAL POLYMERIZATION PRESSURE OF SAID ETHYLENE AND AT A TEMPERATURE OF FROM 130 TO 190*C. UNTIL FROM 30 TO 90% OF THE OXYGEN BECOMES CHEMICALLY COMBINED, THE REMAINING 70 TO 10% OF THE OXYGEN REMAINING UNCOMBINED AS AN ACTIVE COMPONENT OF SAID ETHYLENE POLYMERIZATION CATALYST, (2) COMBINED SAID ETHYLENE POLYMERIZATION CATALYST WITH FURTHER ETHYLENE IN SUCH PROPORTION THAT THE TOTAL CONCENTRATION OF FREE PLUS CHEMICALLY COMBINED OXYGEN IS FROM 10 TO 4,000 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF ETHYLENE, AND (3) POLYMERIZING THE ETHYLENE AT A PRESSURE ABOVE THE CRITICAL POLYMERIZATION PRESSURE OF SAID ETHYLENE AT A TEMPERATURE OF FROM 100 TO 180*C.
Claim 2
Dependent Claim
154 words
A PROCESS FOR THE POLYMERIZATION OF ETHYLENE TO SOLID POLYMERS WHICH COMPRISES (1) PREPARING AN ETHYLENE POLYMERIZATION CATALYST BY CONTACTING OXYGEN WITH ETHYLENE IN A PROPORTION OF FROM 50 TO 10,000 PARTS BY WEIGHT OF OXYGEN PER MILLION PARTS BY WEIGHT OF ETHYLENE AT A PRESSURE BELOW THE CRITICAL POLYMERIZATION PRESSURE OF SAID ETHYLENE AND AT A TEMPERATURE OF FROM 130 TO 190*C. UNTIL FROM 30 TO 90% OF THE OXYGEN BECOMES CHEMICALLY COMBINED, THE REMAINING 70 TO 10% OF THE OXYGEN REMAINING UNCOMBINED AS AN ACTIVE COMPONENT OF SAID ETHYLENE POLYMERIZATION CATALYST, (2) COMBINED SAID ETHYLENE POLYMERIZATION CATALYST WITH FURTHER ETHYLENE IN SUCH PROPORTION THAT THE TOTAL CONCENTRATION OF FREE PLUS CHEMICALLY COMBINED OXYGEN IS FROM 10 TO 4,000 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF ETHYLENE, AND (3) POLYMERIZING THE ETHYLENE AT A PRESSURE ABOVE THE CRITICAL POLYMERIZATION PRESSURE OF SAID ETHYLENE AT A TEMPERATURE OF FROM 100 TO 180*C.
References Cited (Backward Citations)
US2409996A
Cited
US2852501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |