Patents by Inventor Johannes Matheus Gerardus Maria Kaanders

Johannes Matheus Gerardus Maria Kaanders 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).

  • Hearing aid to be worn behind the ear of the user and provided with a pressure-gradient microphone
    Patent number: 4041251
    Abstract: A hearing aid to be worn behind the ear and including a pressure-gradient microphone is designed so as to give a defined directional effect. The rear surface of the microphone communicates with the ambient atmosphere by way of an acoustic resistor comprising a block of sintered material. The overall transmission area of this block is less than one half of the effective area of the microphone diaphragm. The block preferably is detachably accommodated in a rubber mount and may comprise sintered bronze pellets or sintered silicon carbide.
    Type: Grant
    Filed: October 16, 1975
    Date of Patent: August 9, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Johannes Matheus Gerardus Maria Kaanders