Patents by Inventor Arnold Spiegal

Arnold Spiegal 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).

  • Photographic products and processes providing a negative image
    Patent number: 4530898
    Abstract: Photographic film units and processes are disclosed which provide a negative image, wherein exposed silver is developed to high covering power silver and unexposed silver halide is reduced to low covering power silver.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: July 23, 1985
    Assignee: Polaroid Corporation
    Inventor: Arnold Spiegal