Patents Represented by Attorney, Agent or Law Firm Richard H. Burgess
  • Patent number: 5130352
    Abstract: Mouldable filled polyethylene compositions containing particulate lignocellulosic fillers are disclosed. The compositions contain 0-89.97% (by weight of the composition) of polyethylene, 0.01-89.99% (by weight of the composition) of grafted polymer, 10-60% (by weight of the composition) of particulate lignocellulosic material and 0.02-20% (by weight of the composition) of boric acid and/or borax. The boric acid and/or borax is added to suppress odor during manufacture and processing of the compositions. The compositions may be formed into moulded articles e.g. containers and the like.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: July 14, 1992
    Assignee: Canadian Forest Products Ltd.
    Inventor: Suezone Chow
  • Patent number: 5079073
    Abstract: Improved non-stick coating systems can be applied to untreated smooth substrate with a polyamide-imide undercoat 0.1-5.0 microns thick preferably containing colloidal silica and surfactant.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: January 7, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harvey P. Tannenbaum
  • Patent number: 5071695
    Abstract: Non-stick coating systems can be applied to untreated smooth glass and ceramic substrates with a polysiloxane undercoat overlaid with a second undercoat of polyamide imide preferably containing colloidal silica and surfactant, with each undercoat in the range of 0.1-5.0 microns thick.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: December 10, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harvey P. Tannenbaum
  • Patent number: 5049437
    Abstract: Improved non-stick coating systems can be applied to untreated smooth substrate with a polyether sulfone undercoat 0.1-5.0 microns thick preferably containing colloidal silica and surfactant.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: September 17, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harvey P. Tannenbaum
  • Patent number: 4985191
    Abstract: A pinch valve is fabricated by providing an elongated tubular housing with a cut-back portion at an outlet end, applying adhesive to the cut back portion, with a ring around the cut-back portion, placing the housing and ring in a mold and heating all three, providing a core rod inside the housing and forcing an elastomer into the space between the core rod and the housing and between the housing and the ring, curing the elastomer and cooling everything to allow the ring to thermally contract to engage the elastomer between the housing and the ring.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John L. Hannon, Jr.
  • Patent number: 4984765
    Abstract: A mold fill coupling combined with a pinch fill valve and an overflow valve permits filling of a mold at one station and disconnecting the fill valve without rotating the mold.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John L. Hannon, Jr.
  • Patent number: 4974813
    Abstract: A mold fill coupling combined with a pinch fill valve and an overflow valve permits filling of a mold at one station and disconnecting the fill valve without rotating the mold.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: December 4, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John L. Hannon, Jr.
  • Patent number: 4960263
    Abstract: A mold fill coupling combined with a pinch fill valve and an overflow valve permits filling of a mold at one station and disconnecting the fill valve without rotating the mold.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: October 2, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John L. Hannon, Jr.
  • Patent number: 4958888
    Abstract: A countertop having a cutout portion, preferably for inserting a kitchen appliance with an overlapping flange, has corners with stress relief radii cut into the wider sides of the countertop to maximize the radii while keeping the cutout hidden under the flange.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: September 25, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Aron Livnah
  • Patent number: 4925765
    Abstract: Negatively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin and higher triboelectric charging. Preferred are block copolymers of styrene, methyl methacrylate and butyl methacrylate as one block and salts or esters of methacrylic acid or acrylic acid as the other block in the copolymer.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: May 15, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Dennis G. Madeleine
  • Patent number: 4925764
    Abstract: Positively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin. Preferred are block copolymers of styrene with methyl methacrylate and butyl methacrylate as one block and dimethylaminoethyl methacrylate as the other block, quaternized with methyl tosylate or benzyl chloride.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: May 15, 1990
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Dennis G. Madeleine, Carol A. Senkler, Loretta A. Grezzo Page
  • Patent number: 4891401
    Abstract: Acrylic polymers with carboxylic acid and small amounts of phosphorus-containing strong acids are good pigment dispersants for use in water-based coating compositions.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: January 2, 1990
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Jozef T. Huybrechts, Guido R. Louis van den Bosch, Rudolf F. Landriette Verhaegen
  • Patent number: 4888373
    Abstract: A 35-40% weight spray solids coating composition can be achieved with a binder consisting of about 35% polyester, 30% melamine crosslinker and 30% acrylic resin containing a thixotropic agent.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: December 19, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Sonja M. J. Abrams
  • Patent number: 4888383
    Abstract: A method for preparing a stable aqueous dispersion of polyurethane modified polyacrylic involving chain extension of polyacrylic with isocyanate and hydroxyl- or amino-functional groups.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: December 19, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Jozef T. Huybrechts
  • Patent number: 4888372
    Abstract: A 20-25% weight spray solids coating composition can be achieved with a binder consisting of about 30% polyester, 25% melamine crosslinker, 7% of cellulose acetate butyrate and 25% acrylic resin containing a thixotropic agent.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: December 19, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Sonja M. J. Abrams, Robert V. A. Vervoort
  • Patent number: 4853278
    Abstract: An aluminum insert for a rice cooker is coated before drawing with a three-layer release coating. The coated insert is then deep drawn without damaging the coating. The coating has a high proportion of polytetrafluoroethylene to polyamide-imide and a low level of colloidal silica in the primer.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: August 1, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Kenneth Batzar
  • Patent number: 4818350
    Abstract: An aluminum insert for a rice cooker is coated before drawing with a three-layer release coating. The coated insert is then deep drawn without damaging the coating. The coating has a high proportion of polytetrafluoroethylene to polyamide-imide and a low level of colloidal silica in the primer. After drawing, the uncoated exterior of the insert may be anodized to provide a durable, attractive finish.
    Type: Grant
    Filed: August 25, 1986
    Date of Patent: April 4, 1989
    Inventor: Kenneth Batzar
  • Patent number: 4794144
    Abstract: Large acrylic star polymers containing multifunctional monomers in the core are made by group transfer polymerization techniques, preferably by arm-first, core-first, or arm-core-arm approaches.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: December 27, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harry J. Spinelli
  • Patent number: 4759774
    Abstract: Particulate polymethyl methacrylate polymerized in the presence of alumina trihydrate filler provides a superior blasting media for cleaning surfaces, such as for stripping paint from sensitive substrates like aluminum aircraft skin.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: July 26, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jerome Hochberg, Robert B. Young
  • Patent number: 4736003
    Abstract: Silylated oxyanion catalysts, such as trimethyl silyl 3-chlorobenzoate, provide increased livingness of group transfer polymerization, thereby permitting higher molecular weights and polymerization efficiencies.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: April 5, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Luke V. Schneider, Ira B. Dicker