Patents by Inventor Otto Pilz

Otto Pilz 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).

  • Positive nonsilver washout systems containing dihydropyridines and photooxidants
    Patent number: 4271260
    Abstract: Process for preparation of positive images which comprises exposing imagewise a supported layer of a photosensitive composition comprising an alkali-soluble polymeric binder, at least one dihydropyridine compound and at least one hexaarylbiimidazole compound and developing by washing out the exposed image areas. Optionally auxiliary layers can be present between the support and photosensitive layer. The photosensitive elements are useful in preparing positive working printing plates and photoresists.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: June 2, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Werner Abele, Mario Grossa, Otto Pilz
  • Positive non-silver systems containing nitrofuryldihydropyridine
    Patent number: 4181531
    Abstract: Positive working non-silver wash-out system based on 1,4-dihydro-4-(5'-nitro-2'-furyl)-pyridines. Such systems are useful in preparing positive working printing plates and photoresists.
    Type: Grant
    Filed: April 7, 1978
    Date of Patent: January 1, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Otto Pilz