Patents by Inventor Richard David Greenblatt

Richard David Greenblatt 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).

  • Method of and apparatus for training high speed digital telephonic modems to obviate imperfections in the telephone channel, while simultaneously allowing conversation
    Patent number: 5917853
    Abstract: A method and apparatus for "training" high speed telephonic modems to adjust or become corrected to obviate imperfections in the telephone channel or line, such as echoes, phase changes and other effects, while concurrently with voice communication on such simple telephone lines through sending test signals in unoccupied spaces of successive time frames created by compressing concurrent digital voice therein.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: June 29, 1999
    Assignee: Academy of Applied Science
    Inventor: Richard David Greenblatt
  • Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network
    Patent number: 5692040
    Abstract: A method of and apparatus for providing compatible universal identification telephone protocols by generating predetermined unique audio sequences recognizable by the telephone user as defining standardized Audio Icon information and distinct from and separated from one another and other telephonically transmitted signals; sending and receiving such generated audio sequences on a public switched telephone network having paths the parameters of which fall within predetermined specified training sets, including modem performance standards; and assuring recognition and correct identification of such audio sequences conveyed along such paths.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: November 25, 1997
    Inventor: Richard David Greenblatt