The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1989
Filed:
Sep. 14, 1987
Michel Marc, Wellesley, MA (US);
Clint, Inc., Natick, MA (US);
Abstract
A flow molding process and associated molding apparatus for making plastic parts employing a radio-frequency heating field. In a two-piece mold, a diaphragm is supported thereacross and over a foam plastic compound that is disposed in the bottom half of the mold. A fluid is adapted to be introduced into the mold against the diaphragm. The introduction of this fluid is controlled to initially inject the fluid into the mold to cause deflection of the diaphragm to thus expel substantially all air from the mold and to thereafter extract the fluid from the mold during the heating cycle as the material expands, the extraction causing a vacuum that assists in the plastic foam compound expansion.