Patents by Inventor David Hugh Durham

David Hugh Durham 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).

  • Organoclay compositions for gelling unsaturated polyester resin systems
    Patent number: 6635108
    Abstract: An organoclay composition for gelling unsaturated polyester resin/monomer systems comprising a mineral clay mixture which has been treated with an alkyl quaternary ammonium compound. The mineral clay mixture comprises two components: mineral clay (a) comprising greater than 50 wt. %, based on the weight of the mineral clay mixture, of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and mineral clay (b) comprising less than 50 wt. %, based on the weight of the mineral clay mixture, of a smectite.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: October 21, 2003
    Assignee: Southern Clay Products, Inc.
    Inventors: Thomas C. Farrow, Chris A. Rasmussen, William R. Menking, David Hugh Durham
  • Organoclay compositions for gelling unsaturated polyester resin systems
    Patent number: 6534570
    Abstract: An organoclay composition for gelling unsaturated polyester resin/monomer systems comprising a mineral clay mixture which has been treated with an alkyl quaternary ammonium compound. The mineral clay mixture comprises two components; mineral clay (a) comprising greater than 50 wt. %, based on the weight of the mineral clay mixture, of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and mineral clay (b) comprising less than 50 wt. %, based on the weight of the mineral clay mixture, of a smectite.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: March 18, 2003
    Assignee: Southern Clay Products, Inc.
    Inventors: Thomas C. Farrow, Chris A. Rasmussen, William R. Menking, David Hugh Durham
  • Organoclay compositions for gelling unsaturated polyester resin systems
    Publication number: 20020002230
    Abstract: An organoclay composition for gelling unsaturated polyester resin/monomer systems comprising a mineral clay mixture which has been treated with an alkyl quaternary ammonium compound. The mineral clay mixture comprises two components; mineral clay (a) comprising greater than 50 wt. %, based on the weight of the mineral clay mixture, of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and mineral clay (b) comprising less than 50 wt. %, based on the weight of the mineral clay mixture, of a smectite.
    Type: Application
    Filed: August 3, 2001
    Publication date: January 3, 2002
    Applicant: Southern Clay Products, Inc.
    Inventors: Thomas C. Farrow, Chris A. Rasmussen, William R. Menking, David Hugh Durham
  • Organoclay compositions and method of preparation
    Patent number: 6036765
    Abstract: An organoclay composition comprising a mineral clay mixture which has been treated with an alkyl quaternary ammonium salt said mixture comprising: mineral clay (a) comprising 50 to 95 wt. %, based on the weight of the mineral clay mixture, of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and mineral clay (b) comprising the balance by weight of the mineral clay mixture, of a smectite.
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: March 14, 2000
    Assignee: Southern Clay Products
    Inventors: Thomas C. Farrow, Chris A. Rasmussen, William R. Menking, David Hugh Durham, Paul W. Carroll
  • High temperature environmentally benign drilling fluid, and viscosifying additives for use therewith
    Patent number: 5837654
    Abstract: An oil base environmentally benign drilling fluid composition having a stable high viscosity and high gel strength at use temperatures of up to at least 450.degree. F. The drilling fluid includes a low toxicity biodegradable oil vehicle, and as a viscosifying agent an organoclay which is the reaction product of a mineral clay mixture and an alkyl quaternary ammonium salt. The mineral clay mixture comprises at least 50% by weight of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and substantially the balance of the mixture is a smectite. Conventional additives such as emulsifiers and fillers may also be present in the drilling fluid.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: November 17, 1998
    Assignee: Southern Clay Products, Inc.
    Inventors: Paul W. Carroll, David Hugh Durham, Thomas C. Farrow