Patents by Inventor William C. Pershak

William C. Pershak 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).

  • Tear open blister package
    Patent number: 4694960
    Abstract: A tear open blister package of the type having a blister receptacle formed of plastic which has a periperhal flange secured to a flat backing. A tab extends from the receptacle at the flange for grasping during opening of the package, with the tab being unsecured to the backing. A tear initiation cut is provided in the plastic material of the receptacle at the intersection of the tab with the flange for initiating tearing of the plastic material.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: September 22, 1987
    Assignee: Plastic Specialties, Inc.
    Inventors: Cornelius M. Phipps, William C. Pershak