Patents by Inventor Derek W. Sproson

Derek W. Sproson 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).

  • Vitreous enamel coating powder
    Publication number: 20080196627
    Abstract: An improved method for making an enamel coating powder includes the steps of: (a) forming an aqueous suspension of prescribed percentages of sol-gel glass formers, powdered glass filler and additives, wherein the additives are chosen so as give the resulting vitreous enamel coating the desired decorative and functional properties, (b) converting this suspension into particles having a prescribed particle size distribution, (c) heating the particles to drive off water and salt anions that are chemically bound to the particles, and (d) coating the particles so as to provide them with the degree of resistivity required for use with dry electrostatic spray systems.
    Type: Application
    Filed: February 16, 2007
    Publication date: August 21, 2008
    Inventor: Derek W. Sproson
  • Rare earth-containing frits having a high glass transition temperature and their use for the production of enamels having improved heat resistance
    Patent number: 5264287
    Abstract: The present invention is directed to an alkali borosilicate frit which is capable of being applied to a metal substrate by the dry powder electrostatic process at a transfer efficiency of at least 70%, has a glass transition temperature of >525.degree. C. and contains, based on the total weight of the frit:______________________________________ Oxide Wt % ______________________________________ K.sub.2 O 6 to 10 Na.sub.2 O 5.5 to 9 LiO.sub.2 0 to 4 ZrO.sub.2 0 to 4 TiO.sub.2 0 to 4 ZnO 0 to 15 B.sub.2 O.sub.3 8 to 15 SiO.sub.2 40 to 60 La.sub.2 O.sub.3 3 to 9 CaO 0 to 15 F 0 to 2 Fe.sub.2 O.sub.3 0 to 3 CoO 0 to 5 NiO 0 to 5, ______________________________________wherein the total weight of CoO plus NiO is at least 1.The present invention is also directed to enamels for self-cleaning ovens containing these frits.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: November 23, 1993
    Assignee: Miles Inc.
    Inventors: Vernon J. Grebe, Elie E. Saad, Derek W. Sproson, Arthur C. Stidham
  • Rare earth-containing frits having a high glass transition temperature and their use for the production of enamels having improved heat resistance
    Patent number: 5198393
    Abstract: The present invention is directed to an alkali borosilicate frit which is capable of being applied to a metal substrate by the dry powder electrostatic process at a transfer efficiency of at least 70%, has a glass transition temperature of >525.degree. C. and contains, based on the total weight of the frit:______________________________________ Oxide Wt % ______________________________________ K.sub.2 O 6 to 10 Na.sub.2 O 5.5 to 9 LiO.sub.2 0 to 4 ZrO.sub.2 0 to 4 TiO.sub.2 0 to 4 ZnO 0 to 15 B.sub.2 O.sub.3 8 to 15 SiO.sub.2 40 to 60 La.sub.2 O.sub.3 3 to 9 CaO 0 to 15 F 0 to 2 Fe.sub.2 O.sub.3 0 to 3 CoO 0 to 5 NiO 0 to 5, ______________________________________wherein the total weight of CoO plus NiO is at least 1.The present invention is also directed to enamels for self-cleaning ovens containing these frits.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: March 30, 1993
    Assignee: Miles Inc.
    Inventors: Vernon J. Grebe, Elie E. Saad, Derek W. Sproson, Arthur C. Stidham