US3067147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of foaming and extruding polyethylene using 1, 2-dichlorotetrafluoroethane as the foaming agent
Assignee: Dow Chemical Co
•
Filing: 1957-08-28
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Granted: 1962-12-04
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Expires: 1977-08-28
Abstract
No abstract record available.
Inventors
- 👤 Louis C Rubens
- 👤 Griffin John Dennis
- 👤 Urchick Demetrius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; B; B01; B01J; B01J8/00; B01J8/0015; C08F; C08F10/00; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S585/00; Y10S585/949; Y10S585/956
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS WHICH COMPRISES HEATING NORMALLY SOLID POLYETHYLENE AT HEAT-PLASTIFYING TEMPERATURES BETWEEN 90* AND 200*C. IN ADMIXTURE WITH FROM 0.05 TO 0.5 GRAM MOLECULAR PROPORTION OF 1,2-DICHLOROTETRAFLUOROETHANE PER 100 GRAMS OF THE POLYETHYLENE, UNDER PRESSURE TO FORM A FLOWABLE GEL AND EXTRUDING SAID GEL INTO A ZONE OF LOWER PRESSURE SUFFICIENT TO EXPAND THE EXTRUDED GEL WITH RESULTANT FORMATION OF A CELLULAR POLYETHYLENE BODY.
Claim 2
Dependent Claim
64 words
A PROCESS WHICH COMPRISES HEATING NORMALLY SOLID POLYETHYLENE AT HEAT-PLASTIFYING TEMPERATURES BETWEEN 90* AND 200*C. IN ADMIXTURE WITH FROM 0.05 TO 0.5 GRAM MOLECULAR PROPORTION OF 1,2-DICHLOROTETRAFLUOROETHANE PER 100 GRAMS OF THE POLYETHYLENE, UNDER PRESSURE TO FORM A FLOWABLE GEL AND EXTRUDING SAID GEL INTO A ZONE OF LOWER PRESSURE SUFFICIENT TO EXPAND THE EXTRUDED GEL WITH RESULTANT FORMATION OF A CELLULAR POLYETHYLENE BODY.
References Cited (Backward Citations)
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GB626151A
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US2576977A
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US2774991A
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FR1081583A
Cited
US2772246A
Cited
US2757147A
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Cited
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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) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |