Patents by Inventor Raymond A. Firmani

Raymond A. Firmani 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).

  • Photoimaging systems with cyclic hydrazides
    Patent number: 4247618
    Abstract: A photosensitive system comprising in intimate admixture (1) a dye in its leuco form, (2) a photooxidant taken from the group of hexaarylbiimidazole compounds, benzophenone, para-aminophenyl ketones, polynuclear quinones and thioxanthenones, and mixtures thereof and in the presence of the admixture is a 5-member-heterocyclic phenylhydrazide compound. The cyclic phenylhydrazide can be present in the admixture, or a dry coating of the admixture, after imagewise exposure, is treated with a solution of the heterocyclic compound. The system is useful in formation of colored images.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: January 27, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Rolf Dessauer, Raymond A. Firmani