Patents by Inventor Michael A. Schen

Michael A. Schen 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).

  • Latex particles incorporating stabilized fluorescent rare earth labels
    Patent number: 4784912
    Abstract: Improved fluorescent labels comprise a fluorescent rare earth chelate incorporated into a polymeric particle derived from a loadable latex. The polymer comprises: (a) from about 50 to about 96 weight percent of recurring units derived from a hydrophobic ethylenically unsaturated polymerizable monomer, (b) from about 2 to about 30 weight percent of recurring units derived from a nonionic hydrophilic ethylenically unsaturated polymerizable monomer, and (c) from about 2 to about 20 weight percent of recurring units derived from an anionic ethylenically unsaturated polymerizable monomer containing at least one solubilizing group. The labels of this invention have greatly improved stability in aqueous solutions and do not prematurely agglomerate during storage. They can be attached to any of a variety of physiologically reactive species to provide labeled species, and are particularly useful in specific binding assays.
    Type: Grant
    Filed: October 26, 1987
    Date of Patent: November 15, 1988
    Assignee: Eastman Kodak Company
    Inventors: James R. Schaeffer, Tsang J. Chen, Michael A. Schen
  • Stabilized fluorescent rare earth labels and labeled physiologically reactive species
    Patent number: 4735907
    Abstract: Improved fluorescent labels comprise a fluorescent rare earth chelate incorporated into a polymeric particle derived from a loadable latex. The polymer comprises: (a) from about 50 to about 96 weight percent of recurring units derived from a hydrophobic ethylenically unsaturated polymerizable monomer, (b) from about 2 to about 30 weight percent of recurring units derived from a nonionic hydrophilic ethylenically unsaturated polymerizable monomer, and (c) from about 2 to about 20 weight percent of recurring units derived from an anionic ethylenically unsaturated polymerizable monomer containing at least one solubilizing group. The labels of this invention have greatly improved stability in aqueous solutions and do not prematurely agglomerate during storage. They can be attached to any of a variety of physiologically reactive species to provide labeled species, and are particularly useful in specific binding assays.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: April 5, 1988
    Assignee: Eastman Kodak Company
    Inventors: James R. Schaeffer, Tsang J. Chen, Michael A. Schen
  • Latex compositions comprising loadable polymeric particles
    Patent number: 4684608
    Abstract: A latex composition having utility in articles such as photographic elements is disclosed. The composition comprises loadable polymer particles having recurring units a, b and c wherein:component a is 10 to 100 weight percent of a tetrahydrofurfuryl monomer having the structure: ##STR1## in which R.sub.1 represents O or NH; andR.sub.2 represents H or lower alkyl of about 1 to 6 carbon atoms;component b is 0 to 20 weight percent of a hydrophilic monomer andcomponent c is 0 to 90 weight percent of a hydrophobic monomer.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: August 4, 1987
    Assignee: Eastman Kodak Company
    Inventors: James W. Brown, Tsang J. Chen, Michael A. Schen
  • Latex compositions comprising loadable polymeric particles
    Patent number: 4608424
    Abstract: A latex composition having utility in articles such as photographic elements is disclosed. The composition comprises loadable polymer particles having recurring units a, b and c wherein:component a is 10 to 100 weight percent of a tetrahydrofurfuryl monomer having the structure: ##STR1## in which R.sub.1 represents O or NH; andR.sub.2 represents H or lower alkyl of about 1 to 6 carbon atoms;component b is 0 to 20 weight percent of a hydrophilic monomer andcomponent c is 0 to 90 weight percent of a hydrophobic monomer.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: August 26, 1986
    Assignee: Eastman Kodak Company
    Inventors: James W. Brown, Tsang J. Chen, Michael A. Schen
  • Latex compositions comprising loadable polymeric particles
    Patent number: 4497929
    Abstract: A latex composition having utility in articles such as photographic elements is disclosed. The composition comprises loadable polymer particles having recurring units a, b and c wherein:component a is 10 to 100 weight percent of a tetrahydrofurfuryl monomer having the structure: ##STR1## in which R.sub.1 represents O or NH; andR.sub.2 represents H or lower alkyl of about 1 to 6 carbon atoms;component b is 0 to 20 weight percent of a hydrophilic monomer andcomponent c is 0 to 90 weight percent of a hydrophobic monomer.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: February 5, 1985
    Assignee: Eastman Kodak Company
    Inventors: James W. Brown, Tsang J. Chen, Michael A. Schen