Patents Assigned to W. R. Grace Limited
  • Foldable waterproofing structure
    Patent number: 5348791
    Abstract: A Structure comprising a membrane of a waterproofing pressure sensitive adhesive material with, contiguous thereto, a layer of relatively rigid covering material so arranged and divided into segments that the structure can be folded at the divisions between the segments.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: September 20, 1994
    Assignee: W. R. Grace Limited
    Inventors: Peter J. Thompson, Timothy J. Martin
  • Relief printing plate manufacture
    Patent number: 4927723
    Abstract: A relief flexographic printing plate is prepared by image-wise exposure of the "printing face" of a layer of photocurable polymer through a negative 7 and image-wise back exposure of the layer 4 through a support sheet 3 and a positive 6 of the image to be printed, thereby selectively curing the floor regions 9 of the printing plate in register with the uncured areas 8 left in the printing face of said layer.Preferably a further non-selective back exposure operation is carried out for additionally curing the floor regions.
    Type: Grant
    Filed: June 7, 1988
    Date of Patent: May 22, 1990
    Assignee: W. R. Grace Limited
    Inventor: George B. Cusdin
  • Insulating material
    Patent number: 4539262
    Abstract: An insulating material in the form of a body comprising expanded plastics beads which are each encapsulated in bitumen or a bituminous compound which is free from solvents, light oils, emulsifiers or other liquifying agents, such encapsulation having been formed by a hot process, the encapsulated beads having been subsequently pressed together and distorted to form a body with voids between the beads substantially eliminated.
    Type: Grant
    Filed: January 20, 1983
    Date of Patent: September 3, 1985
    Assignee: W. R. Grace Limited
    Inventor: John Hurst
  • Separator for concrete wrapping to submarine pipelines
    Patent number: 4044091
    Abstract: A generally T-shaped flexible spacer for use in the formation of a flexible joint in concrete cladding for pipes, having a base flange and a compressible web extending generally perpendicularly from the base flange on one side thereof. In use, spacers are applied to a pipe at intervals, and are self supporting with the web radial of the pipe. When concrete is sprayed onto the pipe it forms a cladding in sections, between which the spacers provide compressible joints to accommodate bending of the pipe.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: August 23, 1977
    Assignee: W. R. Grace Limited
    Inventor: John Hurst
  • Separator for concrete wrapping to submarine pipelines
    Patent number: 4037627
    Abstract: A generally T-shaped flexible spacer for use in the formation of a flexible joint in concrete cladding for pipes, having a base flange and a compressible web extending generally perpendicularly from the base flange on one side thereof. In use, spacers are applied to a pipe at intervals, and are self supporting with the web radial of the pipe. When concrete is sprayed onto the pipe it forms a cladding in sections, between which the spacers provide compressible joints to accommodate bending of the pipe.
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: July 26, 1977
    Assignee: W. R. Grace Limited
    Inventor: John Hurst