Patents by Inventor Mark G. Luttrell

Mark G. Luttrell 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).

  • Safety indicator system
    Patent number: 5482654
    Abstract: A method for use in warning about wet flooring conditions is disclosed. The method comprises the use of an indicator composition containing from about 90 to about 50 wt. % of basic compound; and from about 10 to about 50 wt. % of a compound selected from the group consisting of a phthalic anhydride derivative of the formula ##STR1## and a poly-nitrophenolic compound of the formula ##STR2## wherein n is an integer selected from 0 to 4, each Y and each Z is selected from an alkyl group having 1 to 6 carbon atoms and hydrogen, B is selected from hydrogen and --NO.sub.2, and X is selected from ##STR3## whereby an intensely colored solution is formed when the composition is in the presence of an amphoprotic liquid.
    Type: Grant
    Filed: November 9, 1994
    Date of Patent: January 9, 1996
    Assignee: Warnaway Corporation
    Inventors: Mark G. Luttrell, Lyle D. Wescott, Jr.