Patents by Inventor David Pocknell

David Pocknell 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: 5348392
    Abstract: The apparatus is adapted to be held in one hand of an operator from mixing components of a composition packaged as two or more individually stable components of substantially equal volume and viscosity each in a receptacle having a closure made of a material which can be ruptured, and to dispense the mixed composition by a manual operation. The device comprises a mixing housing, separate chambers for the receptacles, piercing means for piercing the receptacles, plunger means for expelling a component from the chamber into the mixing region, a mixing element in the mixing region, and a passageway which contains means for actuating the mixing element and through which the mixed composition may be expelled from the mixing region.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: September 20, 1994
    Assignee: Dow Corning France S.A.
    Inventors: Philippe L. Bouquet, David Pocknell, Werner Bruning, Martina Dittrich-Duster, Gunter Lamers
  • Patent number: 5153231
    Abstract: A multi-component foamable silicone composition is described and claimed which is capable of curing quickly at 20.degree. C. to provide a low density foamed mass. The composition comprises (A) one or more polydiorganosiloxanes having not less than three alkyl-hydrogensiloxane units per molecule, (B) one or more polydiorganosiloxanes having not less than two alkenyl-siloxane units (C) a liquid alcohol, (D) a fluorinated silicone foam stabilizing material and (E) a platinum catalyst for promoting reaction between the components. The composition may be packaged as two or more individually stable parts of substantially equal volume and viscosity each in a receptacle of material which is adapted to be opened by rupture so as to release the components for admixture. The composition is intended for use in forming a foam medical dressing by dispensing onto a surface e.g. an open wound and allowing the composition to cure at room temperature.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: October 6, 1992
    Assignee: Dow Corning France S.A.
    Inventors: Philippe L. Bouquet, David Pocknell
  • Patent number: 5145933
    Abstract: Non-friable siloxane gels which can be used for gel dressings and in medical prostheses are made from compositions comprising (A) alkenyl-containing polydiorganosiloxanes; (B) hydrosilicon compounds having at least 3 Si-H groups; (C) SiH end-blocked polydiorganosiloxanes and (D) a catalyst. These compositions cure rapidly at room temperature having a ratio (RHAlk) of SiH:Si-Alkenyl of from 3:1 to 20:1, the percentage of silicon-bonded H atoms provided by (C) not being less than 81.36-(3.6.times.RHAlk) and having a value of from 10% to 90%.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: September 8, 1992
    Assignee: Dow Corning France S.A.
    Inventors: Bernard F. R. Grisoni, David Pocknell
  • Patent number: 4991574
    Abstract: A surgical dressing comprising a sheet of silicone gel having a wound-facing surface and laminated to the other surface a film of silicone elastomer.The dressing is particularly adapted to the treatment of burns.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: February 12, 1991
    Assignee: Dow Corning Corporation
    Inventor: David Pocknell
  • Patent number: 4888074
    Abstract: The specification describes and claims a method of making therapeutic rings from a curable silicone rubber based composition. The rings are capable of controlled release of the therapeutic agent in the human or animal body. The method includes the steps of:(i) extruding a first composition comprising a therapeutic agent and a first elastomer-forming silicone composition to provide a core;(ii) extruding a second composition comprising a second elastomer-forming silicone composition to provide a sheath enclosing the core;(iii) bringing together end portions of a piece of extruded core and sheath to form a ring,(iv) effecting crosslinking of the extruded core, and(v) effecting crosslinking of the extruded sheath.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: December 19, 1989
    Assignee: Dow Corning France S.A.
    Inventor: David Pocknell
  • Patent number: 4791149
    Abstract: The specification is directed to making noncellular dressings such as gelatinous wound dressings. According to the invention medical and surgical dressings are made by use of packages which may be held in the hand, and which contain the components of two part curable polysiloxane compositions in such a manner that the component may be mixed in predetermined proportions and dispensed therefrom under the influence of propellant gas. The method avoids the need for manual mixing of such compositions during production of dressings.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: December 13, 1988
    Assignee: Dow Corning France S.A.
    Inventor: David Pocknell
  • Patent number: 4719243
    Abstract: The specification is directed to polysiloxane foams. There are disclosed compositions capable of curing at room temperature which comprise a hydroxypolysiloxane, an alkylhydrogen polysiloxane, a tin compound as catalyst and finely divided filler. According to the invention storage stability of these foam forming polysiloxane compositions is improved by use as filler of silica which has been pretreated to render is hydrophobic. The subject compositions may comprise two components which do not require individual mixing prior to mixing together of the components. The compositions may be packaged in any convenient manner. The compositions may be used for a variety of purposes, for example to provide medical dressings.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: January 12, 1988
    Assignee: Dow Corning France S.A.
    Inventor: David Pocknell
  • Patent number: 4660553
    Abstract: A medical-surgical dressing comprising a reinforced sheet of silicone elastomer foam having a thickness not exceeding 10 millimeters, one of the surfaces of the sheet having a surface layer of open cell foam and the other surface having a substantially non-cellular surface skin. The dressing may be manufactured by a process comprising depositing a liquid foamable silicone composition on an absorbent surface, allowing the composition to foam and set to an elastomer and thereafter separating the foam sheet from the substrate.The dressings are useful e.g. for the treatment of wounds, burns and as liners for plaster casts.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: April 28, 1987
    Assignee: Dow Corning Ltd.
    Inventors: Clifford Naylor, David Pocknell
  • Patent number: 4572814
    Abstract: A medical-surgical dressing comprising a reinforced sheet of silicone elastomer foam having a thickness not exceeding 10 millimeters, one of the surfaces of the sheet having a surface layer of open cell foam and the other surface having a substantially non-cellular surface skin. The dressing may be manufactured by a process comprising depositing a liquid foamable silicone composition on an absorbent surface, allowing the composition to foam and set to an elastomer and thereafter separating the foam sheet from the substrate.The dressings are useful e.g. for the treatment of wounds, burns and as liners for plaster casts.
    Type: Grant
    Filed: June 30, 1983
    Date of Patent: February 25, 1986
    Assignee: Dow Corning, Ltd.
    Inventors: Clifford Naylor, David Pocknell