Patents by Inventor James Kenneth Davenport Royle

James Kenneth Davenport Royle 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).

  • Patent number: 4013687
    Abstract: Dyestuffs of the formulaeD--Z--O--OC--X--O).sub.y H].sub.nandD--Z--O--OC--X--O).sub.(y.sub.-1) COT].sub.nwherein D is the radical of an anthraquinone dyestuff which is attached to Z through a carbon atom of an aromatic ring present in D; Z is a divalent bridging group; n is a positive integer having a value of 1 to 4; X is a divalent saturated or unsaturated aliphatic radical containing at least 8 carbon atoms and in which there are at least 4 carbon atoms between the --CO-- and --O-- groups; T is a saturated or unsaturated aliphatic radical of from 8-20 carbon atoms and y is a positive number in the range 2-20 inclusive.A process for making the above dyestuffs and their use as dispersing agents in the stabilization of dispersions of finely divided solids.
    Type: Grant
    Filed: December 10, 1974
    Date of Patent: March 22, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: Hugh Patrick Dryhurst Paget, Leslie Richard Rogers, James Kenneth Davenport Royle, James Frederick Stansfield, Arthur Topham