Patents by Inventor Donald James Leslie

Donald James Leslie 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).

  • Selective high frequency compression device for speaker system
    Patent number: 4084474
    Abstract: A multiband speaker system means includes a high frequency section normally balanced with one or more lower freqency sections. A thermistor is serially associated only with the high frequency section whereby, for certain high power signal combinations, a lesser proportionate increase in output occurs in the high frequency section than the low frequency section. This not only makes possible a lower power rating, but also eliminates certain effects that are not musically desirable.
    Type: Grant
    Filed: February 4, 1976
    Date of Patent: April 18, 1978
    Inventor: Donald James Leslie