Patents by Inventor Leonard Dubrowsky

Leonard Dubrowsky 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).

  • Electromagnet for programmable microwave circulator
    Patent number: 4682126
    Abstract: A "Spacercore" design is used to provide the cores of the electromagnets which are used to bias ferrite slabs in phase shifters of a high power RF attenuator. The phase shifters require a given flux to provide a phase shift from zero to 90.degree.. With laminations of high permeability silicon steel, the core weight may be substantially reduced by including a filler comprising spacers of non-magnetic material (such as lightweight transformer pressboard. With 14-mil silicon steel laminations and 64-mil spacers, this construction provides a core which weighs 25 percent of a full ferrite core for the same flux density.
    Type: Grant
    Filed: June 1, 1984
    Date of Patent: July 21, 1987
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Walter E. Milberger, Joel R. Cohen, Leonard Dubrowsky