Patents by Inventor Alan C. Farthing

Alan C. Farthing 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).

  • Process for preparing N,N,N',N'-tetraphenyldiaminomethane
    Patent number: 4167526
    Abstract: N,N,N',N'-tetraphenyldiaminomethane, antioxidant for rubber, is prepared by reaction of 2 molar proportions of diphenylamine and 0.8-1.3 molar proportions of formaldehyde at room temperature. The reaction may be carried out in a storage container, for example a thermoplastic container which, holding the tetraphenyldiamonomethane, can be added to and will blend into a rubber mix.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: September 11, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Alan C. Farthing, Eric S. Nicholson