Patents by Inventor Daniel R. Fruge

Daniel R. Fruge 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).

  • Powdered packaged developer
    Patent number: 4816384
    Abstract: A storage stable and rapid dissolving packaged powder developer of uniform composition is produced by preparing developer or developer precursor solutions and removing solvent to provide powder for packaging in plastic impervious to the atmosphere. Preferably, the solvent is removed by freeze-drying or spray-drying.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: March 28, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Daniel R. Fruge, Peter K. Sysak
  • Wash-off film containing synthetic amphoteric polymers
    Patent number: 4735887
    Abstract: Sharper edges are obtained in silver halide wash-off films for tanning development when from 5 to 60% of the unhardened gelatin binder in one or more layers is replaced with a synthetic amphoteric polymer consisting essentially of at least one of each of three constituents: (a) carboxylic acid, (b) alkyl primary amine, and (c) secondary and/or tertiary amine, the amphoteric polymer having an isoelectric point of from 4 to 8.
    Type: Grant
    Filed: June 27, 1986
    Date of Patent: April 5, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert P. Foss, Daniel R. Fruge