US3062729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed articles of ethylene-propylene copolymers and method of making
Assignee: Dow Chemical Co
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Filing: 1961-04-10
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Granted: 1962-11-06
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Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Richard E Skochdopole
- 👤 Louis C Rubens
- 👤 Giffin D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/143; C08J2323/00; C08J2323/02; C08J2323/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A METHOD FOR MAKING A FOAMED PLASTIC ARTICLE WHICH COMPRISES FORMING A HOMOGENEOUS GEL OF AN OLEFIN POLYMER MATERIAL SELECTED FROM THE GROUP CONSISTING OF CO-POLYMERS OF FROM 25 TO 65 PERCENT BY WEIGHT OF ETHYLENE AND FROM 75 TO 35 PERCENT OF PROPYLENE, AND MIXTURES OFF AT LEAST 80 PERCENT BY WEIGHT OF SUCH COPOLYMER AND NOT MORE THAN 20 PERCENT BY WEIGHT OF POLYPROPYLENE, AND AT LEAST ONE VOLATILE ORGANIC COMPOUND SELECTED FORM THE GROUP CONSISTING OF ISOBUTANE, PROPANE, 1,1,1-TRIFLUORO-2CHLOROETHANE, 1,1,1-TRIFLUOROETHANE, MONOCHLOROPENTAFLUOROETHANE, 1,1,1-TRIFLUOROPROPANE, OCTAFLUOROPROPANE, DICHLORODIFLUOROMETHANE AND DICHLOROTETRAFLUOROETHANE AT TEMPERATURE BETWEEN 105* AND 180*C. UNDER PRESSURE, COOLING SAID GEL TO A FOAMING TEMPERATURE WITHIN THE RANGE OF FROM 30* TO 90*C., THEN RELEASING THE PRESSURE SUFFICIENTLY TO ESPAND THE EXTRUDED GEL AND FORM A POROUS BODY AND SUBJECTING THE POROUS BODY TO BOMBARDMENT BY HIGH SPEED ELECTRONS OF A VELOCITY SUFFICIENT TO PENETRATE THE FOAM AND SUBJECT THE FOAM TO A DOSES OF FROM ONE TO 20 MEGARADS IN A PERIOD OF FROM 1 TO ABOUT 1800 SECONDS.
Claim 2
Independent Claim
169 words
A METHOD FOR MAKING A FOAMED PLASTIC ARTICLE WHICH COMPRISES FORMING A HOMOGENEOUS GEL OF AN OLEFIN POLYMER MATERIAL SELECTED FROM THE GROUP CONSISTING OF CO-POLYMERS OF FROM 25 TO 65 PERCENT BY WEIGHT OF ETHYLENE AND FROM 75 TO 35 PERCENT OF PROPYLENE, AND MIXTURES OFF AT LEAST 80 PERCENT BY WEIGHT OF SUCH COPOLYMER AND NOT MORE THAN 20 PERCENT BY WEIGHT OF POLYPROPYLENE, AND AT LEAST ONE VOLATILE ORGANIC COMPOUND SELECTED FORM THE GROUP CONSISTING OF ISOBUTANE, PROPANE, 1,1,1-TRIFLUORO-2CHLOROETHANE, 1,1,1-TRIFLUOROETHANE, MONOCHLOROPENTAFLUOROETHANE, 1,1,1-TRIFLUOROPROPANE, OCTAFLUOROPROPANE, DICHLORODIFLUOROMETHANE AND DICHLOROTETRAFLUOROETHANE AT TEMPERATURE BETWEEN 105* AND 180*C. UNDER PRESSURE, COOLING SAID GEL TO A FOAMING TEMPERATURE WITHIN THE RANGE OF FROM 30* TO 90*C., THEN RELEASING THE PRESSURE SUFFICIENTLY TO ESPAND THE EXTRUDED GEL AND FORM A POROUS BODY AND SUBJECTING THE POROUS BODY TO BOMBARDMENT BY HIGH SPEED ELECTRONS OF A VELOCITY SUFFICIENT TO PENETRATE THE FOAM AND SUBJECT THE FOAM TO A DOSES OF FROM ONE TO 20 MEGARADS IN A PERIOD OF FROM 1 TO ABOUT 1800 SECONDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |