×

Keyboard

  • US 4,443,789 A
  • Filed: 11/13/1981
  • Issued: 04/17/1984
  • Est. Priority Date: 01/22/1974
  • Status: Expired due to Fees
First Claim
Patent Images

1. A keyboard operated signal producing apparatus comprising an input keyboard having a set of five manually operable finger keys arranged for operation with only one hand, and each of said keys being arranged for operation with a different finger of said one hand, said keys being selectively operable to provide a different pre-selected combination of operated and non-operated ones of said keys for each alphabetic character in an alphabetic system having a total number of characters greatly exceeding the number of said keys, means responsive to operation of selected ones of said keys for producing a unique coded electrical output for each of the different combinations of operated and non-operated ones of said keys, whereby each unique coded output represents a different character in said system, there being a unique pre-selected combination of said keys assigned for operation to represent each character in a majority of the characters making up said system to thereby provide a group of unique key combinations in which each unique key combination of the group represents a different character in said majority of characters, the arrangement of said keys being pre-selected to provide a pictographic relationship between each key combination in a majority of said unique combinations and the alphabetic character represented thereby.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×