Patents by Inventor David Ellis Clarke

David Ellis Clarke 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: 6303565
    Abstract: The invention provides a process of improving the viscosity stability upon storage at temperatures of 25° C. or more but below 40° C. of a fabric softening composition comprising: (a) a 8 to 50% by weight of a cationic fabric softening agent; and (b) perfume by the inclusion of 3.5% to 15% by weight of an emulsified silicone, based upon the total amount of the composition, which has been emulsified with one or more cationic surfactants. In one aspect, the viscosity of the silicone before emulsification is from 10,000 cSt to 400,000 cSt, preferably from 20,000 cSt to 350,000 cSt, more preferably from 25,000 cSt to 250,000 cSt and the emulsion is a macro-emulsion. In another aspect, the median emulsified silicone droplet size is at least 0.2 &mgr;m, preferably at least 0.25 &mgr;m, more preferably at least 0.39 &mgr;m, preferably also no greater than 25 &mgr;m.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: October 16, 2001
    Assignee: Unilever Home & Personal Care USA, Divison of Conopco, Inc.
    Inventors: David Ellis Clarke, Samantha Small
  • Patent number: 6251850
    Abstract: A fabric softening composition comprising: (a) a cationic fabric softening compound; and (b) an emulsified silicone. In one aspect the viscosity of the silicone before emulsification is from 10,000 cSt to 1,000,000 cSt, preferably from 30,000 cSt to 750,000 cSt, more preferably from 40,000 cSt to 400,000 cSt, most preferably 45,000 cSt to 250,000 cSt, eg 45,000 cSt to 200,000 cSt and the emulsion is a macro-emulsion. In another aspect, the median silicone droplet size in the emulsion is at least 0.2 &mgr;m, preferably at least 0.25 &mgr;m, more preferably at least 0.39 &mgr;m, preferably also no greater than 25 &mgr;m and is emulsified with an emulsifier comprising one or more cationic surfactants.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: June 26, 2001
    Assignee: Unilever Home & Personal Care USA, division of Conopco, Inc.
    Inventors: David Ellis Clarke, Serge Firmin Creutz, Benoit Henault, Samantha Small