US2945020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming fine polyethylene powders
Assignee: Armstrong World Industries Inc
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Filing: 1959-08-13
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Granted: 1960-07-12
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Expires: 1979-08-13
Abstract
No abstract record available.
Inventors
- 👤 Wade E Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:30
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A METHOD FOR REDUCING THE PARTICLE SIZE OF POLYETHYLENE WHICH COMPRISES ADMIXING RELATIVE PROPORTIONS OF 5-25 PARTS BY WEIGHT POLYETHYLENE AT A TEMPERATURE LESS THAN THE MELTING POINT OF THE POLYETHYLENE IN THE RANGE OF 80*-135*C. WITH 100 PARTS BY WEIGHT OF A SOLVENT-NONSOLVENT MIXTURE, AND AGITATING THE RESULTING MIXTURE AT SAID TEMPERATURE FOR A PERIOD OF 5-45 MINUTES TO FORM FINELY-DIVIDED POLYETHYLENE, SAID SOLVENT-NONSOLVENT MIXTURE CONSISTING ESSENTIALLY OF 75%-95% BY WEIGHT OF A HYDROCARBON SOLVENT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, PENTANE, NEOPENTANE, HEXANE, CYCLOHEXANE, HEPTANE, OCTANE AND MIXTURES THEREOF, THE BALANCE BEING A POLAR NONSOLVENT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL, BUTANOL, ETHYLENE GLYCOL, GLYCEROL, ACETONE, METHYL ETHYL KETONE, METHYL ISOBUTYL KETONE, AND MIXTURES THEREOF.
Claim 2
Independent Claim
127 words
A METHOD FOR REDUCING THE PARTICLE SIZE OF POLYETHYLENE WHICH COMPRISES ADMIXING RELATIVE PROPORTIONS OF 5-25 PARTS BY WEIGHT POLYETHYLENE AT A TEMPERATURE LESS THAN THE MELTING POINT OF THE POLYETHYLENE IN THE RANGE OF 80*-135*C. WITH 100 PARTS BY WEIGHT OF A SOLVENT-NONSOLVENT MIXTURE, AND AGITATING THE RESULTING MIXTURE AT SAID TEMPERATURE FOR A PERIOD OF 5-45 MINUTES TO FORM FINELY-DIVIDED POLYETHYLENE, SAID SOLVENT-NONSOLVENT MIXTURE CONSISTING ESSENTIALLY OF 75%-95% BY WEIGHT OF A HYDROCARBON SOLVENT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, PENTANE, NEOPENTANE, HEXANE, CYCLOHEXANE, HEPTANE, OCTANE AND MIXTURES THEREOF, THE BALANCE BEING A POLAR NONSOLVENT FOR POLYETHYLENE SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL, BUTANOL, ETHYLENE GLYCOL, GLYCEROL, ACETONE, METHYL ETHYL KETONE, METHYL ISOBUTYL KETONE, AND MIXTURES THEREOF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |