Patents by Inventor Lawrence P. Nahay

Lawrence P. Nahay 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).

  • Solid state two-wire/four-wire converter with common battery
    Patent number: 4053722
    Abstract: A hybrid system utilizing a plurality of operational amplifiers provides for appropriate isolation of input and output signalling. A signal initially appearing at the incoming path of the four-wire line appears as a balanced signal at the two-wire input/output end of the system but is effectively canceled from appearing at the output path of the four-wire input/output end. A signal initially placed on the two wire input/output end of the system appears at the output of the four-wire input/output end but is effectively canceled from the input line of the four-wire input/output end. A direct current path for common battery supply of loop current, while maintaining line impedance match over the audio frequency bandwidth is maintained.
    Type: Grant
    Filed: October 4, 1976
    Date of Patent: October 11, 1977
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Lawrence P. Nahay
  • 20 Hz Ringdown solid state two-wire/four-wire converter
    Patent number: 4037065
    Abstract: A hybrid system utilizing a plurality of operational amplifiers provides for appropriate isolation of input and output signalling. A signal initially appearing at the incoming path of the four-wire line appears as a balanced signal at the two-wire input/output end of the system but is effectively canceled from appearing at the ouput path of the four-wire input/output end. A signal initially placed on the two-wire input/output end of the system appears at the output of the four-wire input/output end but is effectively canceled from the input line of the four-wire input/output end. A 20 Hz threshold detector senses signals from the two-wire input/output line.
    Type: Grant
    Filed: October 4, 1976
    Date of Patent: July 19, 1977
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Lawrence P. Nahay