Patents by Inventor Richard L. Walden

Richard L. Walden 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: 5130665
    Abstract: An audio volume controller includes a variable gain amplifier which amplifies an audio signal and drives a sound transducer such as a loud speaker. A volume controller is responsive to the level of the audio signal to adjust the gain of the amplifier to maintain the level of sound reproduced by the speaker between manually adjustable minimum and maximum values. A second minimum level control is provided to set a predetermined minimum audio signal level below which the gain of the amplifier is not increased in an attempt to maintain the sound level above the manually adjusted level.
    Type: Grant
    Filed: February 14, 1991
    Date of Patent: July 14, 1992
    Inventor: Richard L. Walden