Patents by Inventor Richard O. Thomalla

Richard O. Thomalla 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).

  • Automatic volume and frequency controlled sound masking system
    Patent number: 4438526
    Abstract: A sound masking system for generating background sound. The background sound is automatically adjusted to ambient noise levels by adjusting the amplitude of the frequency levels detected.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: March 20, 1984
    Assignee: Conwed Corporation
    Inventor: Richard O. Thomalla