Patents Represented by Law Firm Birch, Stewart, Kolasch & Birch Birch, Stewart, Kolasch & Birch
  • Elastic surface wave filter
    Patent number: 4047129
    Abstract: An elastic surface wave filter having a substrate of ceramic material and input and output transducer electrodes of interleaved-comb-type rigidly mounted on one surface of the substrate. A top covering is mounted on the electrode-mounted surface of the substrate. This substrate concurrently serves as a medium through which, when the filter is energized, an elastic surface wave is propagated from the input transducer electrode towards the output transducer electrode and also as a closure for closing the opening of the top covering.
    Type: Grant
    Filed: March 12, 1976
    Date of Patent: September 6, 1977
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Hideki Ishiyama