Patents by Inventor Laurence G. Dammann

Laurence G. Dammann 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).

  • Patent number: 4732945
    Abstract: Disclosed is a new partial capping synthesis wherein resinous mixtures containing controlled amounts of phenolic hydroxyl and/or mercapto functionality, and aliphatic hydroxyl functionality are synthesized. Such synthesis comprises providing one or more resins which in total contain aliphatic primary and/or secondary hydroxyl functionality and oxirane functionality. A single resin or blend of resins may provide the requisite functionality. The one or more resins then are reacted with a carboxyl-functional capping agent bearing phenolic hydroxyl functionality and/or mercapto functionality. This reaction is conducted under reaction conditions and for a time such that the carboxyl functionality of the capping agent selectively reacts with the oxirane functionality of the one or more resins to produce a resinous product containing aliphatic hydroxyl functionality and containing phenolic hydroxyl functionality and/or mercapto functionality.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: March 22, 1988
    Assignee: Ashland Oil, Inc.
    Inventor: Laurence G. Dammann
  • Patent number: 4495367
    Abstract: A new composition of matter comprising an acrylamide or methacrylamide monomer characterized by the following structural formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen or methyl; R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are lower alkyls; n is an integer ranging from 1 to 6; and X and Y are the same or different anions.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: January 22, 1985
    Assignee: Celanese Corporation
    Inventor: Laurence G. Dammann
  • Patent number: 4451628
    Abstract: This invention provides a process for preparing water-soluble polymers with a controlled low molecular weight, the molecular weight of the polymer being controlled by the presence of a calculated quantity of methallylsulfonate monomer during the polymerization reaction. The molecular weight of the polymer varies inversely with the quantity of methallylsulfonate monomer that is present. Low molecular weight water-soluble polymers are useful as oil well drilling additives, dispersants and the like.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: May 29, 1984
    Assignee: Celanese Corporation
    Inventor: Laurence G. Dammann
  • Patent number: 4374216
    Abstract: This invention provides a non-gelling water-in-oil high solids slurry dispersion of water-soluble polymer.The slurry dispersion composition contains between about 40-80 weight percent of water-soluble polymer, and is prepared by dehydrating a water-in-oil dispersion of synthetic water-soluble polymer, and then slurrying a quantity of finely divided water-soluble polymer into the dehydrated dispersion.
    Type: Grant
    Filed: December 9, 1981
    Date of Patent: February 15, 1983
    Assignee: Celanese Corporation
    Inventor: Laurence G. Dammann
  • Patent number: 4338239
    Abstract: This invention provides a novel polyacrylate thickening agent which is composed of monomers comprising (1) (meth)acrylic acid, (2) glyceryl allyl ether derivative, and optionally (3) one or more other polymerizable monomers.In another embodiment, this invention provides a print paste containing the defined novel polyacrylate thickening agent.
    Type: Grant
    Filed: March 30, 1981
    Date of Patent: July 6, 1982
    Assignee: Celanese Corporation
    Inventor: Laurence G. Dammann