Patents by Inventor David K.-T. Chu

David K.-T. Chu 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: 5530410
    Abstract: Acoustic frequency mixing devices for controlling high frequency signals by the generation of acoustic waves are disclosed. The devices include (a) a crystalline substrate of MTiOXO.sub.4 (wherein M is K, Rb, Tl and/or NH.sub.4 and X is P and/or As) having a surface with at least two input areas; and (b) an input interdigital transducer deposited on each of at least two signal input areas of said substrate surface, each IDT suitable for connection to a source of electric signal and for inverse piezoelectrically generating acoustic waves (e.g., SAWs or B-G waves) in the substrate. For controlling high frequency electrical signals, the substrate surface has a output area and the device typically includes an output electrode (e.g.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: June 25, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: David K.-T. Chu