Patents by Inventor Pieter C. Koomen

Pieter C. Koomen 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).

  • Dual blade windshield wiper
    Patent number: 4524481
    Abstract: A flexible wiper, having a body portion supporting a pair of opposed longitudinal slots for engaging a harness of a wiper arm, includes a pair of parallel spaced apart blades depending from the body portion for operating in concert to wipe a surface. A cavity extending throughout the body portion is disposed intermediate the pair of blades and is defined in part by a flexible membrane interconnecting facing sides at the bases of the blades.
    Type: Grant
    Filed: November 28, 1983
    Date of Patent: June 25, 1985
    Inventor: Pieter C. Koomen