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:
Jun. 08, 2004
Filed:
Nov. 15, 1999
Howard Huss, North Huntingdon Township, Westmoreland County, PA (US);
Eldon Eady, Hempfield, PA (US);
James Varney, North Huntingdon Township, Westmoreland County, PA (US);
Westinghouse Air Brake Technologies Corporation, Wilmerding, PA (US);
Abstract
A method for making an injection molded multilayer polymer pump diaphragm having one side resistant to chemicals. The method can include injecting molten polymer material of a first type having chemical resistance properties into a first pump diaphragm mold cavity to produce a first pump diaphragm layer; curing the first pump diaphragm layer; applying an adhesive to one side of the first pump diaphragm layer; placing the first pump diaphragm layer in a second pump diaphragm mold cavity sized to receive an amount of a second type of polymer material against the adhesive painted side of the first pump diaphragm layer; injecting molten polymer material of the second type into the second pump diaphragm mold cavity into contact with the adhesive to produce a second pump diaphragm layer adhered to first pump diaphragm layer; and curing the second pump diaphragm layer such that said first and second pump diaphragm layers adhere together to form a pump diaphragm having one side which is resistant to chemicals.