Patents by Inventor Bart J. Bremmer

Bart J. Bremmer 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).

  • Derivatives of cyano-substituted ketones and aldehydes
    Patent number: 4365073
    Abstract: Novel cyano- and hydroxyl-substituted cyclic compounds of the formula: ##STR1## wherein B, R, R' and R" are named substituents are disclosed.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: December 21, 1982
    Assignee: The Dow Chemical Company
    Inventors: Bart J. Bremmer, Robert L. Reierson
  • Hydraulic fluids containing cyano derivatives of ketones
    Patent number: 4331549
    Abstract: Hydraulic fluids having high wet equilibrium reflux boiling points, good chemical stability and other desirable characteristics comprise certain cyano-substituted compounds of the formula ##STR1## wherein A and B are specified radicals.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: May 25, 1982
    Assignee: The Dow Chemical Company
    Inventor: Bart J. Bremmer
  • Preparation of symmetrical tetrachloropyridine
    Patent number: 4322538
    Abstract: Symmetrical tetrachloropyridine (2,3,5,6-tetrachloropyridine) is prepared by reacting pentachloropyridine with a source of iodide ions in the presence of a proton source and a solvent medium. The reaction is preferably carried out in a polar, aprotic solvent medium and heated at a temperature of from about 100.degree. C. to about 200.degree. C.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: March 30, 1982
    Assignee: The Dow Chemical Company
    Inventors: Gail E. Vrieland, Bart J. Bremmer, Richard E. Crooks
  • Process for preparing 4-bromotetrachloropyridine
    Patent number: 4321389
    Abstract: A process for producing 4-bromotetrachloropyridine or symmetrical tetrachloropyridine in high purity comprises the selective transhalogenation of pentachloropyridine by a bromide salt in a polar aprotic solvent at a temperature from about 100.degree. C. to about 140.degree. C. followed optionally by selective debromination by hydrogen in the presence of a noble metal catalyst and an acid acceptor to form tetrachloropyridine.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: March 23, 1982
    Assignee: The Dow Chemical Company
    Inventors: G. Edwin Vrieland, Bart J. Bremmer, Richard E. Crooks
  • Hydraulic fluids containing cyano derivatives of cyclic ketals and acetals
    Patent number: 4320024
    Abstract: Hydraulic fluids having high wet equilibrium reflux boiling points, good chemical stability and other desirable characteristics are made from certain cyano-substituted derivatives of cyclic ketals or acetals of the formula ##STR1## wherein A, B and R are specified radicals.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: March 16, 1982
    Assignee: The Dow Chemical Company
    Inventors: Robert L. Reierson, Bart J. Bremmer, Joseph W. Hanafin
  • Preparation of cyano acetals
    Patent number: 4299777
    Abstract: Cyano acetals prepared by the reaction of an alcohol with a nitrile CO and H.sub.2 in the presence of a Co.sub.2 (CO).sub.8 catalyst are more selectively produced at elevated temperatures by the addition of an effective amount of a cyano alkyl amine or carboxy alkyl amine promoter.
    Type: Grant
    Filed: June 13, 1980
    Date of Patent: November 10, 1981
    Assignee: The Dow Chemical Company
    Inventors: Philip E. Garrou, Robert A. Dubois, Bart J. Bremmer