Patents by Inventor David R. Engelhardt

David R. Engelhardt 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: 4925290
    Abstract: A spectalce frame (10) comprises three assemblies; a lens frame assembly (11), a nose piece assembly (12) and an accessory (13), the lens frame assembly comprising a pair of lens frames connected by a frame bridge (24), the accessory comprising an accessory frame (14) which includes an accessory bridge (16), and the nose piece assembly having mounting means (18) thereon which includes a hinge carried by the bridge (21) of the nose piece assembly, which hinge supports the accessory bridge so that the accessory can be in the line of vision or retracted upwardly therefrom, the mounting means also comprising engagement means (22) which can releasably engage the lens frame (23), so that the lens frame can be snapped into or out of position on the nose piece assembly.
    Type: Grant
    Filed: March 29, 1989
    Date of Patent: May 15, 1990
    Assignee: R. Engelhardt Nominees Pty. Ltd.
    Inventor: David R. Engelhardt
  • Patent number: 4531947
    Abstract: A thick coat of polyester powder is imparted onto a heated spectacle frame, some of the powder is removed from the frame hinges and replaced with a thin coat, the coated product is baked to fuse the powder and subsequently immersed in a heated aqueous dispersion of a disperse type dye, and the dyed product is subsequently reheated to a temperature sufficient to cause dye diffusion into the fused coating.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: July 30, 1985
    Assignee: R. Englehardt Nominees Pty. Ltd.
    Inventor: David R. Engelhardt
  • Patent number: D280909
    Type: Grant
    Filed: January 3, 1983
    Date of Patent: October 8, 1985
    Assignee: R. Engelhardt Nominees Pty. Ltd.
    Inventor: David R. Engelhardt