Patents Examined by Covington Raymond
  • Ureidoalkanoylaminocarbonyl amino and imino acids and esters
    Patent number: 4740508
    Abstract: Compounds of the formula ##STR1## are disclosed. These compounds are useful as hypotensive agents due to their angiotensin converting enzyme inhibition activity and depending upon the definition of X may also be useful as analgesics due to their enkephalinase inhibition activity.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: April 26, 1988
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Harold N. Weller, III, Eric M. Gordon
  • Process for the preparation of 1-hydroxy-4-amino-5(8)-nitroanthraquinone
    Patent number: 4424160
    Abstract: 1-Hydroxy-4-amino-5- or -8-nitroanthraquinone is obtained in high yields and in high purity when 1,8-dinitroanthraquinone or 1,5-dinitroanthraquinone respectively is reacted below 80.degree. C. in oleum in the presence of boric acid with reducing agents. The products of the process are valuable polyester dyestuffs as well as dyestuff intermediate products.
    Type: Grant
    Filed: June 16, 1982
    Date of Patent: January 3, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Hederich, Gu/ nter Gehrke