Patents by Inventor Daniel De Leon

Daniel De Leon 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).

  • Line circuit for multiple line telephone
    Patent number: 4394544
    Abstract: A line circuit which allows a multiple line telephone to operate like a private branch exchange (PBX) telephone. Solid state hold and flashing circuits drive a light emitting diode in each telephone connected to the same line.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: July 19, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventor: Daniel De Leon