Patents by Inventor Krishan Kumar Sudan

Krishan Kumar Sudan 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: 4098770
    Abstract: A method of preparing a modified phenol-formaldehyde resin in solid particulate form comprising reacting together, in an aqueous medium, phenol and formaldehyde, in a ratio of 1.0 mole phenol to between 1.8 and 3.5 moles of formaldehyde, in the presence of between 0.1 and 1.0 moles of a basic catalyst; continuing this reaction until a desired viscosity is reached; modifying the reaction system by adding thereto between 0 and 30%, based on the weight of phenol originally taken of a non-phenolic polyhydroxy compound; spray drying the thus modified liquid resin in a pressure nozzle drier, and chilling the spray dried particulate solid. These solid resins are redispersible in water and stable on storage, compared to the known aqueous, equivalent, systems.
    Type: Grant
    Filed: September 15, 1976
    Date of Patent: July 4, 1978
    Assignee: Reichhold Chemicals Limited
    Inventors: Antoine Berchem, Krishan Kumar Sudan, Edward Michael Gres