Patents by Inventor Virgile L. Hedgcoth

Virgile L. Hedgcoth 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).

  • Inkless fingerprinting device and method adapted for recordation of a plurality of fingerprints
    Patent number: 4262623
    Abstract: A plurality of fingerprints of a person are recorded by applying a solution of a first substantially colorless chemical reagent to the fingertips. Essentially invisible fingerprints are obtained by gently pressing the fingers having the solution of the first chemical reagent thereon on a suitable recording sheet. Subsequently the recording sheet is exposed to sublimed vapors of a second chemical reagent. The first and second chemical reagents are selected to react with one another to yield a highly colored substance which is formed on the surface of the recording sheet providing a visible image of the fingerprints. Ferric chloride and a 8-hydroxyquinoline are ideally suited chemical reagents for use in this invention. An apparatus of unitary construction incorporating a replaceable dispensing pad having the solution of the first chemical, is disclosed.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: April 21, 1981
    Assignee: Park Management and Development Co.
    Inventors: Jay Smith, III, Virgile L. Hedgcoth, Thomas H. Grimm