US2831846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting of polyethylene
Assignee: Dow Chemical Co
•
Filing: 1955-10-31
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Granted: 1958-04-22
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Richard E Edmonson
- 👤 William E Wroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD FOR CONVERTING SOLID POLYETHYLENE IN PARTICULATE FORM HAVING LOW BULK DENSITY INTO HEAT-PLASTIFIED COMPRISES DISPERSING A SOLID POLYETHYLENE IN PARTICULATE COMPRISES DISPERSING A SOLID POLYETHYLENE IN PARTICULATE FORM INTO A HEAT-TRANSFER LIQUID TO PRODUCE A STIRRABLE SLURRY CONTAINING FROM 5 TO 50 PERCENT BY VOLUME OF SOLID POLYETHYLENE PARTICLES, HEATING THE SLURRY WHILE MAINTAINING THE HEAT-TRANSFER LIQUID IN THE LIQUID STATE TO CAUSE THE PARTICLES OF POLYETHYLENE TO FUSE WITHOUT DEGRADATION, COALESCING THE FUSED PARTICLES OF POLYETHYLENE INTO A HEATPLASTIFIED MASS AND FORMING A LAYER THEREOF AND A LAYER OF THE HEAT-TRANSFER LIQUID, AND SEPARATING THE RESULTING LAYER OF HEAT-PLASTIFIED POLYETHYLENE FROM THE LAYER OF HEATTRANSFER LIQUID, THE HEAT-TRANSFER LIQUID BEING ONE THAT, AT THE TEMPERATURE EMPLOYED FOR FUSION OF THE POLYETHYLENE, IS SUBSTANTIALLY INSOLUBLE, IN A NON-SOLVENT FOR, THE CHEMICALLY INACTIVE WITH, THE POLYETHYLENE.
Claim 2
Independent Claim
137 words
A METHOD FOR CONVERTING SOLID POLYETHYLENE IN PARTICULATE FORM HAVING LOW BULK DENSITY INTO HEAT-PLASTIFIED COMPRISES DISPERSING A SOLID POLYETHYLENE IN PARTICULATE COMPRISES DISPERSING A SOLID POLYETHYLENE IN PARTICULATE FORM INTO A HEAT-TRANSFER LIQUID TO PRODUCE A STIRRABLE SLURRY CONTAINING FROM 5 TO 50 PERCENT BY VOLUME OF SOLID POLYETHYLENE PARTICLES, HEATING THE SLURRY WHILE MAINTAINING THE HEAT-TRANSFER LIQUID IN THE LIQUID STATE TO CAUSE THE PARTICLES OF POLYETHYLENE TO FUSE WITHOUT DEGRADATION, COALESCING THE FUSED PARTICLES OF POLYETHYLENE INTO A HEATPLASTIFIED MASS AND FORMING A LAYER THEREOF AND A LAYER OF THE HEAT-TRANSFER LIQUID, AND SEPARATING THE RESULTING LAYER OF HEAT-PLASTIFIED POLYETHYLENE FROM THE LAYER OF HEATTRANSFER LIQUID, THE HEAT-TRANSFER LIQUID BEING ONE THAT, AT THE TEMPERATURE EMPLOYED FOR FUSION OF THE POLYETHYLENE, IS SUBSTANTIALLY INSOLUBLE, IN A NON-SOLVENT FOR, THE CHEMICALLY INACTIVE WITH, THE POLYETHYLENE.
References Cited (Backward Citations)
US2386674A
Cited
US2309522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |