Patents by Inventor Raymond C. Crowdis

Raymond C. Crowdis 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).

  • Analog/digital telephone test set
    Patent number: 5163079
    Abstract: An analog/digital telephone test set for telephone lines using dial pulse, DTMF, and digital signalling having a DTMF decoder for converting DTMF tones for application to a microprocessor which converts them, for example, to 16 bit digital commands transmitted as 8 kHz bursts.
    Type: Grant
    Filed: December 12, 1990
    Date of Patent: November 10, 1992
    Inventor: Raymond C. Crowdis