Patents by Inventor David H. Harmon

David H. Harmon 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 making urea-formaldehyde insulation
    Patent number: 4366122
    Abstract: A process and apparatus are provided for making desired shapes of urea-formaldehyde suitable for use as insulation from urea-formaldehyde foam. Fluid urea-formaldehyde foam (A) is formed into discrete particles (A') in particle generator (10) which also partially cures particles (A'). After particles (A') are fully cured, they are blended with fluid urea-formaldehyde foam in mixing apparatus (11) which includes blending head (66) to produce mixture (C) which is a coherent mass. Mixture (C) is molded to the desired cross-sectional shape by molding conveyor (12). Cutter (132) cuts formed mixture (C) into the desired length. Thereafter oven (146) is utilized for fully curing the product which is then enclosed in a suitable packaging material.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: December 28, 1982
    Assignee: Ciba-Geigy Corporation
    Inventors: Charles E. Elmore, David H. Harmon
  • Process for making urea-formaldehyde insulation
    Patent number: 4291128
    Abstract: A process and apparatus are provided for making desired shapes of urea-formaldehyde suitable for use as insulation from urea-formaldehyde foam. Fluid urea-formaldehyde foam (A) is formed into discrete particles (A') in particle generator (10) which also partially cures particles (A'). After particles (A') are fully cured, they are blended with fluid urea-formaldehyde foam in mixing apparatus (11) which includes blending head (66) to produce mixture (C) which is a coherent mass. Mixture (C) is molded to the desired cross-sectional shape by molding conveyor (12). Cutter (132) cuts formed mixture (C) into the desired length. Thereafter oven (146) is utilized for fully curing the product which is then enclosed in a suitable packaging material.
    Type: Grant
    Filed: February 8, 1980
    Date of Patent: September 22, 1981
    Assignee: Ciba-Geigy Corporation
    Inventors: Charles E. Elmore, David H. Harmon