Patents by Inventor Richard R. L. Wells

Richard R. L. Wells 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: 4869991
    Abstract: A charge director composition dispersed in at least one solvent comprising:A. a salt mixture comprised of 1-10 parts by weight each of:(i) a chromium salt of a C.sub.14-18 alkyl salicylic acid;(ii) a calcium didecyl sulfosuccinate; and(iii) a salt of the didecyl ester of sulfosuccinate acid and at least 50% of the basic nitrogen radicals of a copolymer of lauryl methacrylate, stearyl methacrylate and 2-methyl-5-vinyl pyridine, said copolymer having a vinyl pyridine content of 20-30% by weight and an average molecular weight of 15,000-250,000; andB. a salt-free copolymer of (i) laurylmethacrylate and (ii) a monomer selected from 2- or 4-vinylpyridine, styrene and N,N-dimethylaminoethylmethacrylate and mixtures thereof, said copolymer having a molecular weight from about 15,000 to about 100,000, and the weight ratio of monomers B(i) to B(ii) is from about 4:1 to about 50:1; and wherein the weight ratio of B:A is from 10:3 to about 40:3.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: September 26, 1989
    Assignee: Olin Hunt Specialty Products Inc.
    Inventors: Joseph deGraft-Johnson, Chi Ma, Richard R. L. Wells