Patents by Inventor Rudolph Bernard Zijlstra

Rudolph Bernard Zijlstra 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).

  • Vacuum cleaner
    Patent number: D243944
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: April 5, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Rudolph Bernard Zijlstra