Patents by Inventor Lloyd E. Keller

Lloyd E. Keller 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).

  • Device for measuring response speed and accuracy
    Patent number: 5289389
    Abstract: A response speed and accuracy measurement device includes a multidigit code generator for generating a multidigit code of numeric or alphabetic characters or other symbols. A start switch causes a code to be generated and displayed for a limited time duration. The operator then attempts to enter the last displayed code as quickly as possible using the data entry keys of a keyboard. A timer measures the operator's response time. A comparator checks the entered code against the displayed code for detecting a match. An output is generated in the event of a match to indicate the operator's response time.
    Type: Grant
    Filed: January 7, 1992
    Date of Patent: February 22, 1994
    Inventor: Lloyd E. Keller
  • Response speed and accuracy measurement device
    Patent number: 5079726
    Abstract: A response speed and accuracy measurement device includes a multidigit code generator for generating a multidigit code of numeric or alphabetic characters or other symbols. An operator controlled start switch causes a code to be generated and displayed for a limited fixed time duration. The operator then attempts to enter the last displayed code as quickly as possible using the data entry keys of a keyboard. A timer measures the operators response time. A comparator checks the entered code against the displayed code for detecting a match. An output is generated in the event of a match to indicate the operator's response time.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: January 7, 1992
    Inventor: Lloyd E. Keller