Patents by Inventor Anne C. Graham

Anne C. Graham 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).

  • Modular electronic keyboard with improved signal generation
    Patent number: 5115705
    Abstract: An improved percussive action electronic keyboard for play as a musical instrument of the type having pivoted playing keys having camming surfaces distal from finger contact surfaces thereof, pivoted hammers having cam follower surfaces for following the playing key camming surfaces, hammer stop for stopping the swing of the hammer in response to depression of its associated key, includes an electronic sensor for generating an electrical signal for each key which is related in amplitude to the pressure with which the key is depressed during play of the keyboard, and a scanning keyboard state monitor connected to said sensor including a keyboard scanner for scanning each of the keys of the keyboard to determine if a key event has occurred, an amplitude comparator for determining when a key depression causes a said key depression signal amplitude to pass predetermined minimum and maximum amplitude threshold values, a scan counter for counting the number of scans occurring between the scans when the key depressi
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: May 26, 1992
    Inventors: Charles Monte, Paul J. White, Anne C. Graham
  • Percussive action modular electronic keyboard
    Patent number: 5003859
    Abstract: An improved percussive action electronic keyboard for play as a musical instrument of the type having pivoted playing keys having camming surfaces distal from finger contact surfaces thereof, pivoted hammers having cam follower surfaces for following the playing key camming surfaces, hammer stop for stopping the swing of the hammer in response to depression of its associated key, includes an electronic sensor for generating an electrical signal for each key which is related in amplitude to the pressure with which the key is depressed during play of the keyboard, and a scanning keyboard state monitor connected to said sensor including a keyboard scanner for scanning each of the keys of the keyboard to determine if a key event has occurred, an amplitude comparator for determining when a key depression causes a said key depression signal amplitude to pass predetermined minimum and maximum amplitude threshold values, a scan counter for counting the number of scans occurring between the scans when the key depressi
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: April 2, 1991
    Assignee: Charles Monte
    Inventors: Charles Monte, Paul J. White, Anne C. Graham