US Patent: 3,666,848 - Method of Producing Closed Mold Polyurethane Foam Moldings Free of Surface Voids by Flushing the Mold with a Vaporized Halogenated Hydrocarbon


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US Patent: 3,666,848

Method of Producing Closed Mold Polyurethane Foam Moldings Free of Surface Voids by Flushing the Mold with a Vaporized Halogenated Hydrocarbon

Patentee:

Robert C. Harper (exact or similar names) - Loveland, Hamilton County, OH

USPTO Classifications:

264/39, 264/48, 264/51, 264/53, 264/85, 264/DIG.14, 521/131, 521/174, 521/51

Tool Categories:

manufacturing : manufacturing processes

Assignees:

Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Nov. 24, 1969
Granted:	May 30, 1972

Patent Pictures:

USPTO (New site tip)
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Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Cincinnati Milling Machine Co.

Description:

Abstract:

Foamed polyurethane moldings free of surface voids and having a substantially uniform skin are formed in a closed mold which has been purged of air with a vaporized liquid halogenated hydrocarbon capable of condensing on the mold walls or dissolving in the molding composition at the temperature and pressure conditions used in molding.