Patents by Inventor Walton J. Hammar

Walton J. Hammar 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).

  • Anti-microbial 2-nitro-3-phenyl benzofurans substituted by carboxy containing group
    Patent number: 4143154
    Abstract: Acidic 2-nitro-3-phenylbenzofurans and their pharmaceutically acceptable salts which are active as antimicrobial agents, processes for their use and intermediates therefor are described.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: March 6, 1979
    Assignee: Riker Laboratories, Inc.
    Inventors: Robert A. Scherrer, Walton J. Hammar, Richard M. Stern
  • Anti-microbial (2-nitro-3-phenyl benzofuranyl)-phenylalkanoic acids and derivatives
    Patent number: 4143152
    Abstract: Compounds wherein a phenylalkanoic acid is substituted by a 2-nitro-3-phenylbenzofuran group which are active as antimicrobial agents, processes for their use and intermediates therefor are described.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: March 6, 1979
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Dibenzo[a,d]cycloheptenes
    Patent number: 4104475
    Abstract: The maleic acid adduct of anthracene is used as a starting material for 11-amino-12-carboalkoxy-9,10-dihydro-9,10-ethanoanthracene, which through reaction with nitrous acid in a protic solvent provides an 11-substituted-12-carboalkoxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cy cloheptene which is then converted into the useful intermediate 12-carboxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cycloheptene.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: August 1, 1978
    Assignee: Riker Laboratories, Inc.
    Inventor: Walton J. Hammar
  • Process for preparing dibenzo[a,d]cycloheptenes
    Patent number: 3950407
    Abstract: The maleic acid adduct of anthracene is used as a starting material for 11-amino-12-carboalkoxy-9,10-dihydro-9,10-ethanoanthracene, which through reaction with nitrous acid in a protic solvent provides an 11-substituted-12-carboalkoxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cy cloheptene which is then converted into the useful intermediate 12-carboxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cycloheptene.
    Type: Grant
    Filed: June 18, 1973
    Date of Patent: April 13, 1976
    Assignee: Riker Laboratories, Incorporated
    Inventor: Walton J. Hammar