Patents by Inventor Robert J. Krawczyk

Robert J. Krawczyk 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).

  • Patent number: 5236134
    Abstract: A method of recovering leaded glass from leaded glass articles such as cathode ray tubes having evaporated aluminum thereon and coatings of phosphors and sodium silicate-containing material, as well as plastic labels and adhesives and other organic films in which the articles are broken into pieces and tumbled in a diphase solution, one phase of which is a solution of an alkaline earth in water and the other phase of which is an organic solvent for a period of time sufficient to remove all coatings and materials from the glass pieces which are then ready for melting and formation of new articles.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: August 17, 1993
    Assignee: Envirocycle Incorporated
    Inventors: Robert J. Krawczyk, James F. Matthews, Louis J. Norman