US2863850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene composition
Assignee: Monsanto Chemicals Ltd
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Filing: 1955-02-21
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Granted: 1958-12-09
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Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 James W Ragsdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:40
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L2205/00; C08L2205/02; C08L91/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR IMPROVING THE ENVIRONMENTAL STRESSCRACKING RESISTANCE OF POLYETHYLENE WHICH COMPRISES HOMOGENEOUSLY MIXING A HOMOPOLYMER OF POLYETHYLENE HAVING A MOLECULAR WEIGHT ABOVE 22,000 WITH 0.5 TO 2% BY WEIGHT OF AN OILY LIQUID HYDROCARBON MIXTURE BYPRODUCE OF THE MASS POLYMERIZATION OF ETHYLENE AT ELEVATED TEMPERATURES AND PRESSURES IN THE PRESENCE OF OXYGEN AS THE POLYMERIZATION CATALYST, SAID LIQUID HAVING A DENSITY OF ABOUT 0.800 AT 25*C., A VISCOSITY OF ABOUT 3-4 CENTIPOISES AT 25*C., FROM 4 TO 6% UNCONJUGATED ETHYLENIC UNSATURATION AND SUBSTANTIALLY NO COMBINED OXYGEN.
Claim 2
Dependent Claim
87 words
A PROCESS FOR IMPROVING THE ENVIRONMENTAL STRESSCRACKING RESISTANCE OF POLYETHYLENE WHICH COMPRISES HOMOGENEOUSLY MIXING A HOMOPOLYMER OF POLYETHYLENE HAVING A MOLECULAR WEIGHT ABOVE 22,000 WITH 0.5 TO 2% BY WEIGHT OF AN OILY LIQUID HYDROCARBON MIXTURE BYPRODUCE OF THE MASS POLYMERIZATION OF ETHYLENE AT ELEVATED TEMPERATURES AND PRESSURES IN THE PRESENCE OF OXYGEN AS THE POLYMERIZATION CATALYST, SAID LIQUID HAVING A DENSITY OF ABOUT 0.800 AT 25*C., A VISCOSITY OF ABOUT 3-4 CENTIPOISES AT 25*C., FROM 4 TO 6% UNCONJUGATED ETHYLENIC UNSATURATION AND SUBSTANTIALLY NO COMBINED OXYGEN.
References Cited (Backward Citations)
GB471590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |