Patents by Inventor David Edward Zofko

David Edward Zofko 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).

  • Patent number: 4037550
    Abstract: A method of hermetically pressure-resistantly double seaming a metal end closure to a metallic container body whose wall is highly-worked, has a substantially axial grain direction and is less than about 0.057 inch thick at its marginal end portion, which includes forming a body curl of the marginal end portion and double seaming the end closure thereto, and, the resulting double seamed metallic container whose double seam includes six substantially axial metallic layers, two of which are a radially compressed body curl.
    Type: Grant
    Filed: May 18, 1976
    Date of Patent: July 26, 1977
    Assignee: American Can Company
    Inventor: David Edward Zofko