Patents by Inventor Ching Tsuei

Ching Tsuei 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).

  • L-tartaric acid salt of a (1R) diastereomer of a 2-azadihydroxybicyclo?2.2.1!heptane compound and the preparation of 2-azabicyclo?2.2.1! heptane compounds
    Patent number: 5831096
    Abstract: A method for the preparation of a compound of formula ##STR1## wherein R is hydrogen or, respectively, a group of formula ##STR2## R.sub.1 is alkyl; Ar is optionally substituted aryl; andR.sub.3' and R.sub.3" are hydrogen, alkyl or phenyl, or R.sub.3' and R.sub.3" taken together with the carbon atom to which they are attached form cycloalkyl, or salt thereof, comprising acid facilitated acetalizing or ketalizing of a compound of formula ##STR3## wherein R.sub.3' and R.sub.3" are as defined above, and R.sub.4' and R.sub.4" are alkoxy, or taken together with the carbon atom to which they are attached form carbonyl, with a compound of formula ##STR4## wherein * represents an R chirality;R, R.sub.1 and Ar are as defined above, or salt thereof in isopropanol.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: November 3, 1998
    Assignee: Rhone-Poulenc Rorer S.A.
    Inventors: Patrick Leon, Michael O'Brien, Denis Largeau, Matthew Powers, Ching Tsuei
  • L-tartaric acid salt of a (1R) diastereomer of a 2-azadihydroxybicyclo?2.2.1!heptane compound and the preparation of 2-azabicyclo?2.2.1!heptane compounds
    Patent number: 5808093
    Abstract: A compound of formula ##STR1## wherein R is a group of formula ##STR2## R.sub.1 is alkyl; and Ar is optionally substituted aryl.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: September 15, 1998
    Assignee: Rhone-Poulenc Rorer S.A.
    Inventors: Michael O'Brien, Patrick Leon, Denis Largeau, Ching Tsuei, Thierry Durand
  • Stationery box
    Patent number: D431264
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: September 26, 2000
    Inventor: Tai-Ching Tsuei