Patents by Inventor John Henry Walker

John Henry Walker 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).

  • Heterogeneous liquid phase catalytic process for the dehydration of monoethanolamine to ethylenimine
    Patent number: 9162221
    Abstract: A novel heterogeneous liquid phase catalytic process for dehydration of monoethanolamine to ethylenimine and water has been discovered. The process utilizes a novel catalyst made by modifying a cation exchange resin in the hydrogen ion form. The process using the catalyst is performed in a solution of monoethanolamine in a solvent.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: October 20, 2015
    Inventor: John Henry Walker
  • Crosslinkable polymeric coatings and films and composite structures incorporating same
    Patent number: 5891553
    Abstract: A film having a width of at least about one foot as defined by the cross machine direction thereof and a substantially uniform average thickness of less than about 10 mils is formed of a crosslinkable thermoplastic olefin polymer, a crosslinking agent, and preferably a flame retardant. The film can be combined with a suitable substrate to form a prepreg or coated substrate, and the prepreg or coated substrate can be subsequently treated under conditions to crosslink the olefin polymer and to form a rigid composite structure. The composite structure is particularly useful for printed circuit board applications.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: April 6, 1999
    Assignee: Clark-Schwebel, Inc.
    Inventors: James Easton Hendrix, Dennis Joseph Vaughan, James Lee Rakes, John Henry Walker