Patents by Inventor Tomas Malson

Tomas Malson 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).

  • Crosslinked hyaluronate gels, their use and method for producing them
    Patent number: 5783691
    Abstract: The present invention relates to a crosslinked hyaluronic acid derivative in which the crosslinking has been achieved by means of reaction with a phosphorus-containing reagent, especially a derivative of an acid of phosphorus (V). The invention also relates to the methods of producing such a product as well as its use as a slow release depot for administration of hylaluronic acid or a medicament incorporated in the gel.
    Type: Grant
    Filed: April 26, 1996
    Date of Patent: July 21, 1998
    Assignee: Biomatrix, Inc.
    Inventors: Tomas Malson, Bengt Lindqvist
  • Method for preventing secondary cataract
    Patent number: 5375611
    Abstract: Method for extracapsular cataract extraction with or without posterior chamber intraocular lens implantation comprising chemical modification of the posterior surface of the lens capsule, at least in the optical portion of said capsule, for preventing cell attachment and growth.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: December 27, 1994
    Assignee: Pharmacia AB
    Inventors: Bengt Lindqvist, Per Mansson, Tomas Malson
  • Material of polysaccharides containing carboxyl groups, and a process for producing such polysaccharides
    Patent number: 4963666
    Abstract: Method of crosslinking carboxyl-containing polysaccharides in that the polysaccharide is at first activated with a bi- or polyfunctional reagent, and then after removal of any potential excess of activating reagent the crosslinking is performed during drying. The invention also comprises a material produced according to this method.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: October 16, 1990
    Assignee: Pharmacia AB
    Inventor: Tomas Malson
  • Method for preparation of sulfated polysaccharides by treating the polysaccharide with a reducing agent before sulfation
    Patent number: 4814437
    Abstract: A new method for preparation of sulfated polysaccharides by means of pyridine-chlorosulfonic acid reagents. The polysaccharide is before sulfation treated with a reducing agent, e.g. sodium borohydride.
    Type: Grant
    Filed: February 25, 1988
    Date of Patent: March 21, 1989
    Assignee: Pharmacia AB
    Inventors: Anthony N. de Belder, Leif G. Ahrgren, Tomas Malson
  • Shaped article and processes for its preparation
    Patent number: 4772419
    Abstract: A shaped article based upon cross-linked, possibly derivatized hyaluronic acid or a salt thereof is characterized in that it has a dry matter content of at least 65 percent by weight and a tensile strength of at least 2 N/cm.sup.2. The shaped article may be prepared by pressure-drying or freeze-drying a corresponding hyaluronic acid gel.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: September 20, 1988
    Assignee: Pharmacia AB
    Inventors: Tomas Malson, Leif G. Ahrgren, Anthony N. de Belder
  • Composition for ophthalmological use
    Patent number: 4764360
    Abstract: A composition to be used in ophthalmology and containing an aqueous solution of a high molecular polymer to which has been added a polymeric dye having a molecular weight higher than 10,000.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: August 16, 1988
    Assignee: Pharmacia AB
    Inventor: Tomas Malson
  • Gel of crosslinked hyaluronic acid for use as a vitreous humor substitute
    Patent number: 4716154
    Abstract: The invention is concerned with a vitreous humor substitute intended for ophthalmological uses and consisting of a gel of crosslinked hyaluronic acid and a method at retinal surgery and after vitrectomy when the vitreous humor completely or partially is exchanged for such a gel.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: December 29, 1987
    Assignee: Pharmacia AB
    Inventors: Tomas Malson, Bengt L. Lindqvist