Patents by Inventor Thomas L. Steiner

Thomas L. Steiner 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).

  • Cellulose ester microparticles and process for making the same
    Patent number: 5064949
    Abstract: Cellulose ester microparticles with unique properties are made by a process having the following steps:(a) dissolving a cellulose ester in a liquid comprising a solvent for the cellulose ester and a non-solvent for the cellulose ester, thereby forming a dope;(b) spheronizing the dope thereby forming fine droplets of the dope;(c) dropping the droplets for a finite amount of time; and(d) precipitating the droplets in a bath containing a precipitant.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: November 12, 1991
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas L. Steiner, Kenneth A. Domeshek, William Stitt, Jesse L. Riley, Lance J. Deutsch
  • Process for making cellulose ester microparticles
    Patent number: 5047180
    Abstract: Cellulose ester microparticles with unique properties are made by a process having the following steps:(a) dissolving a cellulose ester in a liquid comprising a solvent for the cellulose ester and a non-solvent for the cellulose ester, thereby forming a dope;(b) spheronizing the dope thereby forming fine droplets of the dope;(c) dropping the droplets for a finite amount of time; and(d) precipitating the droplets in a bath containing a precipitant.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: September 10, 1991
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas L. Steiner, Kenneth A. Domeshek, William Stitt, Jesse L. Riley, Lance J. Deutsch
  • Preparation of water soluble cellulose acetate microspheres
    Patent number: 4997599
    Abstract: Microparticle of cellulose acetate and derivatives thereof characterized by being water soluble, having a large interior void space and having a plurality of open exterior surface pores. These water soluble microparticles can be loaded with a chemical selected from the group consisting of pharmaceuticals, dyes, flavorings, agriculturals, solid catalysts and fragrances.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: March 5, 1991
    Assignee: Celanese Fibers Inc.
    Inventors: Thomas L. Steiner, Dana T. Minnick, Kenneth A. Domeshek, Donald H. Lester, Jr.
  • Water soluble cellulose acetate microspheres
    Patent number: 4888420
    Abstract: Microparticle of cellulose acetate and derivatives thereof characterized by being water soluble, having a large interior void space and having a plurality of open exterior surface pores. These water soluble microparticles can be loaded with a chemical selected from the group consisting of pharmaceuticals, dyes, flavorings, agriculturals, solid catalysts and fragrances.
    Type: Grant
    Filed: December 8, 1987
    Date of Patent: December 19, 1989
    Assignee: Celanese Fibers, Inc.
    Inventors: Thomas L. Steiner, Dana T. Minnick, Kenneth A. Domeshek, Donald H. Lester, Jr.