Patents by Inventor David Tschaen

David Tschaen 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).

  • Process for Making Spirolactone Compounds
    Publication number: 20060014950
    Abstract: This invention relates to a process for making spirolactone compounds analogous to formula I.
    Type: Application
    Filed: October 14, 2003
    Publication date: January 19, 2006
    Inventors: Ralph Volante, David Tschaen, Steven Weissman, Mathew Heileman, Toshiaki Mase, Takehiko Iida, Kenji Maeda, Toshihiro Wada, Hiroki Sato, Kenichi Asakawa
  • Preparation and isolation of indolocarbazole glycosides
    Publication number: 20040116688
    Abstract: The present invention relates to a novel process to make indolocarbazole glycosides in high purity which inhibit the growth of tumor cells and are therefore useful in the treatment of cancer in mammals, and the like.
    Type: Application
    Filed: September 25, 2003
    Publication date: June 17, 2004
    Inventors: Steven Weissman, David Tschaen, Asayuki Kamatani, Shouichi Hiraga, Masashi Kawasaki, Takehiko Iida
  • Preparation and isolation of indolocarbazole glycosides
    Patent number: 6559299
    Abstract: The present invention relates to a novel process to make indolocarbazole glycosides in high purity which inhibit the growth of tumor cells and are therefore useful in the treatment of cancer in mammals, and the like.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: May 6, 2003
    Assignees: Merck & Co., Inc., Banyu Pharmaceutical Co., Ltd.
    Inventors: Steven Weissman, David Tschaen, Asayuki Kamatani, Shouichi Hiraga, Masashi Kawasaki, Takehiko Iida
  • Preparation and isolation of indolocarbazole glycosides
    Publication number: 20020193324
    Abstract: The present invention relates to a novel process to make indolocarbazole glycosides in high purity which inhibit the growth of tumor cells and are therefore useful in the treatment of cancer in mammals, and the like.
    Type: Application
    Filed: March 21, 2002
    Publication date: December 19, 2002
    Inventors: Steven Weissman, David Tschaen, Asayuki Kamatani, Shouichi Hiraga, Masashi Kawasaki, Takehiko Iida
  • Diastereoselective preparation of Michael adducts
    Patent number: 6479672
    Abstract: Michael addition conducted in the presence of a zinc-amine complex and additional amounts of the amine component results in product with high diastereomeric excess.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: November 12, 2002
    Assignees: Merck & Co., Inc., Banyu Pharmaceutical Co., Ltd,
    Inventors: Ioannis Houpis, Ralph P. Volante, Fengrui Lang, Ilias Dorziotis, David Tschaen, Shinji Kato, Toshiaki Mase
  • Process of making cox-2 inhibitors having a lactone bridge
    Patent number: 5585504
    Abstract: The invention encompasses a process for making compounds of Formula I useful in the treatment of cyclooxygenase-2 mediated diseases.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: December 17, 1996
    Assignee: Merck & Co., Inc.
    Inventors: Richard Desmond, Ulf Dolling, Ben Marcune, Richard Tillyer, David Tschaen