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:
Feb. 02, 1982
Filed:
Jun. 10, 1976
Edward J Chu, Parsippany, NJ (US);
Resistoflex Corporation, Roseland, NJ (US);
Abstract
Transfer molding of polypropylene, polyvinylidene fluoride, FEP fluorocarbon resin or PFA fluorocarbon resin to produce a lining for a 6' tee pipe fitting is accomplished isothermally by applying pressure of the order of 200 psi to the material while the material, the charge holding chamber and the tee mold are secured in a fixture in an oven. Transfer is performed at a stabilized resin temperature of the order of 375.degree. F. for polypropylene, 450.degree. F. for polyvinylidene fluoride, and 640.degree. F. for FEP and PFA resins over a relatively long time interval. Pressure is removed, the mold assembly is transferred to a press outside the oven, pressure of the order of 700 psi is reapplied to the material, and the mold is force cooled progressively from a remote point back toward the gate which is located in the fitting opposite the stack section thereof.