Patents by Inventor Tessa Malcolm-Brown

Tessa Malcolm-Brown 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).

  • Patent number: 4945015
    Abstract: An intumescent material comprises expandible graphite in a polymeric binder. The binder may be a flexible or elastomeric binder or a formaldehyde resin. A suitable flexible binder is a polymer selected from vinyl acetate polymers, styrene polymers, vinyl chloride polymers, acrylic polymers, vinyl butyral polymers, melamine/urea/phenol formaldehyde resins, polyesters and phenolic resins. A suitable elastomeric binder is a rubber. A suitable formaldehyde resin is melamine formaldehyde resin, urea formaldehyde resin, phenol formaldehyde resin or resorcinol formaldehyde resin.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: July 31, 1990
    Assignee: Dixon International Limited
    Inventors: Bruce A. Milner, Tessa Malcolm-Brown, Eric Southern
  • Patent number: 4931339
    Abstract: An intumescent seal comprises a first body or mass of intumescent material (3) which provides a hard foam on heating and a second body or mass (4) of intumescent material which produces a soft foam on heating. An intumescent seal comprises at least one body of intumescent material (3) which produces a hard foam on heating and at least one body of intumescent material (4) which produces a soft foam on heating, the intumescent materials (3, 4) being carried by at least one of a pair of members or parts between which gap (24) is defined at least in a predetermined relative position of the two members or parts, the intumescent material being disposed so as to intumesce into the gap (24) on heating at least when the members or parts are in said predetermined position.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: June 5, 1990
    Assignee: Dixon International Limited
    Inventor: Tessa Malcolm-Brown
  • Patent number: 4636538
    Abstract: An intumescent material comprises one or more organic polyhydroxy compounds, one or more organic polyamido compounds in free and/or combined form, an ammonium phosphate activator, an amino resin binder, and sodium silicate, the sodium silicate being present in sufficient amounts to prevent the material from totally intumescing quickly when subjected to elevated temperatures, the amounts of sodium silicate ranging from 3 to 12.7% by weight of the total composition but being present in at least 8.9% by weight of the ammonium phosphate activator.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: January 13, 1987
    Assignee: Dixon International Limited
    Inventor: Tessa Malcolm-Brown
  • Patent number: 4599369
    Abstract: An intumescent rubber or elastomeric composition comprises a rubber or elastomer containing:(a) one or more organic polyhydroxy compounds as carbonific;(b) one or more organic polyamido compounds in free and/or combined forms as spumific;(c) an ammonium phosphate as activator for the carbonific; and(d) an amino resin as binder; and in addition to or instead of components (a) to (d),(e) sodium silicate as an intumescent material, components (a) to (d) when present being intermixed with one another.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: July 8, 1986
    Assignee: Dixon International Limited
    Inventor: Tessa Malcolm-Brown
  • Patent number: 4581866
    Abstract: A structural bearing is disclosed which comprises a bearing unit, intumescent material spaced from at least one side of the bearing unit to be protected from fire, and expanded plastics material which is of low compression strength relative to the bearing unit, adjacent to the one side of the bearing unit and disposed between the one side of the bearing unit and at least part of the intumescent material, the intumescent material being adjacent to the expanded plastics material.
    Type: Grant
    Filed: October 4, 1983
    Date of Patent: April 15, 1986
    Assignee: Dixon International Limited
    Inventor: Tessa Malcolm-Brown