Patents by Inventor Murray R. Orpin

Murray R. Orpin 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).

  • Process for hardening phenolic resins
    Patent number: 5378793
    Abstract: This invention relates to a hardener for producing phenolic resins from phenolic resoles which comprises a partial phosphate ester. The hardener is produced by reacting condensed phosphoric acids with polyols at controlled temperatures with vigorous agitation under vacuum until constant acidity is achieved. The hardeners cure the phenolic resoles relatively slowly and therefore enable better control to be achieved when preparing moulded products.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: January 3, 1995
    Assignee: BP Chemicals Limited
    Inventor: Murray R. Orpin
  • Thixotropic compositions
    Patent number: 5334630
    Abstract: This invention relates to a thixotropic laminating resin composition comprising an acid hardenable phenol-aldehyde resin, a highly dispersed hydrophobic amorphous silica and a viscosity modifier wherein the composition has a specified viscosity. Composites laminated with the above composition have improved dimensional stability and are resistant to combustion or smoke emission.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: August 2, 1994
    Assignee: BP Chemicals Limited
    Inventors: Robert S. Francis, Murray R. Orpin
  • High molecular weight polyamide production from dicarboxy terminated polyamide prepolymer
    Patent number: 5079307
    Abstract: This invention relates to a process for producing polyamides of high molecular weight from dicarboxy terminated prepolymers of relatively lower molecular weight by further polymerization in an extruder in the presence of an additive comprising a diamine.The polyamides so formed are suitable for producing fabricated articles such as films, pipes, containers etc.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: January 7, 1992
    Assignee: BP Chemicals (Additives) Limited
    Inventors: Stephen A. Taylor, Matthew B. Studholme, Murray R. Orpin