Patents by Inventor Philip M. Pivawer

Philip M. Pivawer 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).

  • Process for the simultaneous preparation of aromatic acid chlorides and aliphatic acid chlorides
    Patent number: 4163753
    Abstract: By reacting an aromatic compound containing at least one trichloromethyl group bonded to an aromatic carbon atom with an aliphatic acid anhydride in the presence of a catalyst, an aromatic acid chloride and an alkyl carboxylic acid chloride are produced. The desirable products are preferably obtained through distillation at ambient conditions. Although various catalysts can be employed, an acid catalyst, such as sulphuric acid is preferred.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: August 7, 1979
    Assignee: Diaz Chemical Corporation
    Inventor: Philip M. Pivawer
  • Process for preparing bis(2-haloalkyl) phosphoro-halidates
    Patent number: 3987129
    Abstract: An improved process is disclosed for the preparation of bis(2-haloalkyl) phosphorohalidates. This process comprises the steps of reacting phosphorus trihalide with a stoichiometric excess of alkylene oxide to form tris(2-haloalkyl) phosphite, substantially eliminating the presence of unreacted alkylene oxide in the tris(2-haloalkyl) phosphite, and finally converting it to bis(2-haloalkyl) phosphorohalidate by reaction with halogen.
    Type: Grant
    Filed: February 26, 1975
    Date of Patent: October 19, 1976
    Assignee: Olin Corporation
    Inventors: Philip M. Pivawer, Adrian D'Souza, Joseph J. Levitzky
  • Process for the preparation of 3-trichloromethyl-5-chloro-1,2,4-thiadiazole
    Patent number: 3979403
    Abstract: A process is provided for preparing 3-trichloromethyl-5-chloro-1,2,4-thiadiazole in improved yields by reacting a defined molar excess trichloroacetamidine with trichloromethanesulfenyl chloride while controlling pH of the reaction mixture. The present process may advantageously be employed in a batch or continuous process.
    Type: Grant
    Filed: March 31, 1975
    Date of Patent: September 7, 1976
    Assignee: Olin Corporation
    Inventors: Philip M. Pivawer, Douglas A. Farmer, Jr.