Patents by Inventor Harold G. Fravel, Jr.

Harold G. Fravel, Jr. 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).

  • Processes for making thioalkyl carboxamides and amines
    Patent number: 4539416
    Abstract: A process for making N-furfurylthioalkyl carboxamide by reacting an oxaz(ol)ine with furfurylmercaptan in the absence of a transition metal catalyst. The carboxamide may then be hydrolyzed to form the 2-furfurylthioalkylamine.
    Type: Grant
    Filed: June 10, 1983
    Date of Patent: September 3, 1985
    Assignee: The Dow Chemical Company
    Inventors: Harold G. Fravel, Jr., Michael J. Fazio
  • Self-inverting water-in-oil emulsions of water-soluble polymers
    Patent number: 4525496
    Abstract: A water-in-oil emulsion of a water-soluble polymer such as acrylamide/acrylic acid copolymer having improved invertibility is prepared by (1) adding a portion of an inverting surfactant such as sorbitan trioleate having 20 polyoxyethylene units to a water-in-oil emulsion of water-soluble monomer, (2) polymerizing the monomer and (3) adding a remaining amount of inverting surfactant to the emulsion.
    Type: Grant
    Filed: July 17, 1981
    Date of Patent: June 25, 1985
    Assignee: The Dow Chemical Company
    Inventors: Timothy J. Adaway, Harold G. Fravel, Jr., James P. Easterly, Jr.