Patents by Inventor Alan W. Francis

Alan W. Francis 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).

  • Elapsed time indicator
    Patent number: 4550676
    Abstract: An elapsed time indicator in which an indicator, such as a flowable colorant, is releasably contained within an enclosure at least a portion of which is a volatilizable, preferably sublimable, substance.
    Type: Grant
    Filed: August 25, 1983
    Date of Patent: November 5, 1985
    Assignee: S. C. Johnson & Son, Inc.
    Inventor: Alan W. Francis