Patents Assigned to C. Tape Developments Limited
  • Patent number: 4389580
    Abstract: An electroacoustic transducer is provided in the form of a flexible tape formed of an inner flat metal foil 10 surrounded by a metal foil 14 and separated from the latter by an electret 12. The outer metal foil 14 is in turn surrounded by a PVC outer layer 20. This construction provides a flexible electret type of microphone with the additional advantage of immunity from ambient acoustic waves and electrical and magnetic fields.
    Type: Grant
    Filed: January 22, 1981
    Date of Patent: June 21, 1983
    Assignee: C. Tape Developments Limited
    Inventors: Andre P. J. Bendyshe Walton, Francis H. Townsend, John N. Ribet