Patents by Inventor Charles A. Heiberger

Charles A. Heiberger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sound reproduction compositions
    Patent number: 3975321
    Abstract: Novel sound reproduction molding compositions of good processing qualities are disclosed, based on copolymer of vinyl chloride and propylene. Records obtained therefrom, have good audio qualities and resistance to impact, thermal warpage and water blistering. Because of their high heat stability, formulations based on the vinyl chloride-propylene (VC/P) copolymers can be employed in making sound records not only by the usual compression molding techniques, but also by injection molding.
    Type: Grant
    Filed: May 13, 1974
    Date of Patent: August 17, 1976
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Charles A. Heiberger