Patents by Inventor Richard Norris Knowles

Richard Norris Knowles 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).

  • Chemical fire alarm
    Patent number: 4015015
    Abstract: A system for warning people of a fire hazard comprising a flammable substrate having bound thereto a non-vaporous organic compound of molecular weight below 400, which forms a respiratory irritant upon being vaporized. The organic compound remains bound to the substrate in non-vaporous form under normal conditions of use, but is vaporized from the surface upon exposure to temperature no lower than about 200.degree. C.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: March 29, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard Norris Knowles
  • Preparation of salts of antimony (V) esters
    Patent number: 3944586
    Abstract: Water soluble salts of antimony (V) glycol esters are useful flame retardants for such meterials as textiles or polymeric resins. These flame retardants are applied together with a source of organic halogen. A typical such salt is tri(ethylenedioxy)hydrogen antimony (V), sodium salt.
    Type: Grant
    Filed: January 22, 1974
    Date of Patent: March 16, 1976
    Inventor: Richard Norris Knowles