Patents by Inventor Vu San Hoang

Vu San Hoang 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: 4305052
    Abstract: A four-state phase shifter for UHF waves comprises two O-.pi. phase-shifting elements of planar structure on a common substrate, these phase-shifting elements including a symmetrical and an asymmetrical transmission line which can be selectively coupled in one of two ways by the alternate blocking and unblocking of respective diodes for a relative phase reversal. The two phase-shifting elements are linked by two further transmission lines of different propagation constants which can be selectively activated, again with the aid of diodes, and which may be disposed on opposite faces of the substrate or may form part of a coplanar conductor array on the same substrate face.
    Type: Grant
    Filed: December 18, 1979
    Date of Patent: December 8, 1981
    Assignee: Thomson-CSF
    Inventors: Michel Baril, Vu San Hoang