Patents by Inventor Nils Spannhake

Nils Spannhake 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).

  • Process for hardening photographic silver halide emulsions
    Patent number: 4124397
    Abstract: A process for hardening photographic gelatino-silver halide emulsions with glutaraldehyde or substituted glutaraldehydes.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: November 7, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Werner Abele, Wolfgang Pistor, Manfred Schmidt, Harry O. Smith, Nils Spannhake