Patents by Inventor Richard K. Holtman

Richard K. Holtman 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).

  • Apparatus for blow line addition of thermosettable binder in fiberboard manufacture including a cooling nozzle
    Patent number: 4533436
    Abstract: A method and apparatus for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a thermosettable binder, preferably a polyisocyanate binder, is applied through a cooled nozzle to the hot and wet fibrous material in the blow line out of the refiner of a board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: August 6, 1985
    Assignee: The Celotex Corporation
    Inventors: William E. Betzner, Richard K. Holtman
  • Blow line addition of isocyanate binder in fiberboard manufacture
    Patent number: 4407771
    Abstract: A method for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a polyisocyanate binder is applied to the hot and wet fibrous material in the blow line out of the refiner of the board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: October 4, 1983
    Assignee: The Celotex Corporation
    Inventors: William E. Betzner, Richard K. Holtman, Allen R. Hill
  • Blow line addition of thermosettable binder in fiberboard manufacture utilizing cooled nozzle
    Patent number: 4402896
    Abstract: A method and apparatus for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a thermosettable binder, preferably a polyisocyanate binder, is applied through a cooled nozzle to the hot and wet fibrous material in the blow line out of the refiner of a board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: September 6, 1983
    Assignee: The Celotex Corporation
    Inventors: William E. Betzner, Richard K. Holtman