Patents by Inventor Erhard J. Schimitischek

Erhard J. Schimitischek 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).

  • Substituted -6,7,8,9-tetrahydro-pyrido- and 2H-pyrano [2,3-b][1,8]naphthyridines, stable efficient laser dyes
    Patent number: 4202981
    Abstract: Compounds having the formula: ##STR1## wherein X is selected from the group consisting of NH and O, R is selected from the group consisting of H, CH.sub.3 and phenyl, R' is selected from the group consisting of OCH.sub.3, CF.sub.3 CH.sub.3 and H and R" is selected from the group consisting of H, CH.sub.3 and CH.sub.2 CO.sub.2 C.sub.2 H.sub.5. The compounds are stable, efficient laser dyes.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: May 13, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Peter R. Hammond, Ronald A. Henry, John A. Trias, Erhard J. Schimitischek