Patents by Inventor John Derek Rushmere

John Derek Rushmere 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).

  • Apparatus for preparing low-concentration polyaluminosilicate microgels
    Patent number: 5980836
    Abstract: An improved method and apparatus for preparing low-concentration polyaluminosilicate microgels from a water soluble silicate and a strong acid in which the silicate and acid are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged and then diluted to a silica concentration of not more than 1.0 wt. %. The method achieves reduced silica deposition during the preparation of the microgels.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: November 9, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Harvey Moffett, John Derek Rushmere
  • Method for preparing low-concentration polyaluminosilicate microgels
    Patent number: 5853616
    Abstract: An improved method and apparatus for preparing low-concentration polyaluminosilicate microgels from a water soluble silicate and an alkali metal aluminate in which the silicate and the aluminate are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged and then diluted to a silica concentration of not more than 1.0 wt. %. The method achieves reduced silica deposition during the preparation of the microgels.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: December 29, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Harvey Moffett, John Derek Rushmere
  • Process for preparing water soluble polyaluminosilicates
    Patent number: 5707494
    Abstract: An improved method for the production of water soluble polyaluminosilicate microgels, formed by the reaction of solutions of alkali metal silicates with solutions of acids containing dissolved aluminum compounds, is provided.
    Type: Grant
    Filed: January 6, 1997
    Date of Patent: January 13, 1998
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John Derek Rushmere, Robert Harvey Moffett
  • Method for preparing low-concentration polyaluminosilicate microgels
    Patent number: 5648055
    Abstract: An improved method and apparatus for preparing low-concentration polyaluminosilicate microgels from a water soluble silicate and a strong acid in which the silicate and acid are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged and then diluted to a silica concentration of not more than 1.0 wt. %. The method achieves reduced silica deposition during the preparation of the microgels.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: July 15, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert Harvey Moffett, John Derek Rushmere
  • Acid nickel electroplating additive therefor and method of making said additive
    Patent number: 4062738
    Abstract: Primary brightener additives and baths and processes for acid nickel electroplating are provided, as well as a process for making such additives.The additives contain mixtures of alkyne compounds, the major mole fractions of which consist of asymmetrical alkyne sulfonic acids.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: December 13, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John Derek Rushmere
  • Polyamine additives in alkaline zinc electroplating
    Patent number: 4046648
    Abstract: Alkaline zinc electroplating, from baths with small amounts of cyanide or cyanide-free, is enhanced by the use of certain water-soluble polyamines as brighteners. These are the reaction products of first condensing an alkanolamine with an epihalohydrin, and then reacting the condensation product with an amine.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: September 6, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John Derek Rushmere