Patents by Inventor Pui-Kai Li

Pui-Kai Li 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).

  • Patent number: 6638923
    Abstract: Estra-1,3,5(10),16-tetraene derivatives represented by the following formula (I): (wherein R1 is as defined by the present specification.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: October 28, 2003
    Assignees: Kyowa Hakko Kogyo Co., Ltd., Duquesne University of the Holy Ghost
    Inventors: Yoji Ino, Nobuyoshi Amishiro, Taisuke Nakata, Hiroyuki Ishida, Shiro Akinaga, Chikara Murakata, Pui-Kai Li
  • Publication number: 20030008862
    Abstract: Novel sulfatase inhibitor/estrogen receptor blocker compounds useful in the treatment of estrogen dependent illnesses are disclosed. The compounds generally comprise a sulfamate moiety and an aromatic, estrogen receptor blocker moiety. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of an estrogen-dependent disease are also disclosed.
    Type: Application
    Filed: June 18, 2002
    Publication date: January 9, 2003
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 6436918
    Abstract: Novel sulfatase inhibitor compounds useful in the treatment of estrogen dependent illnesses are disclosed. These compounds generally comprise a steroid nucleus substituted at the C17 position. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of a patient are also disclosed.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: August 20, 2002
    Assignees: Duquesne University of the Holy Ghost, Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Pui-Kai Li, Chikara Murakata, Shiro Akinaga
  • Patent number: 6433000
    Abstract: Novel sulfatase inhibitor/estrogen receptor blocker compounds useful in the treatment of estrogen dependent illnesses are disclosed. The compounds generally comprise a sulfamate moiety and an aromatic, estrogen receptor blocker moiety. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of an estrogen-dependent disease are also disclosed.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: August 13, 2002
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Publication number: 20020068726
    Abstract: Novel sulfatase inhibitor compounds useful in the treatment of estrogen dependent illnesses are disclosed. These compounds generally comprise a steroid nucleus substituted at the C17 position. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of a patient are also disclosed.
    Type: Application
    Filed: November 8, 2001
    Publication date: June 6, 2002
    Inventors: Pui-Kai Li, Chikara Murakata, Shiro Akinaga
  • Patent number: 6399595
    Abstract: Novel sulfatase inhibitor compounds useful in the treatment of estrogen dependent illnesses are disclosed. These compounds generally comprise a steroid nucleus substituted at the C17 position. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of a patient are also disclosed.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: June 4, 2002
    Assignees: Duquesne University of the Holy Ghost, Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Pui-Kai Li, Chikara Murakata, Shiro Akinaga
  • Publication number: 20020058651
    Abstract: Estra-1,3,5(10),16-tetraene derivatives represented by the following formula (I): 1
    Type: Application
    Filed: May 18, 2001
    Publication date: May 16, 2002
    Inventors: Yoji Ino, Nobuyoshi Amishiro, Taisuke Nakata, Hiroyuki Ishida, Shiro Akinaga, Chikara Murakata, Pui-Kai Li
  • Patent number: 6376687
    Abstract: Novel sulfatase inhibitor compounds useful in the treatment of estrogen dependent illnesses are disclosed. These compounds generally comprise a steroid nucleus substituted at the C17 position. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of a patient are also disclosed.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: April 23, 2002
    Assignees: Duquesne University of the Holy Ghost, Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Pui-Kai Li, Chikara Murakata, Shiro Akinaga
  • Patent number: 6288050
    Abstract: Sulfatase inhibitor compounds useful in the treatment of estrogen dependent illnesses are disclosed. These compounds generally comprise a steroid nucleus substituted at the C17 position. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of a patient are also disclosed.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: September 11, 2001
    Assignees: Duquesne University of the Holy Ghost, Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Pui-Kai Li, Chikara Murakata, Shiro Akinaga
  • Patent number: 6288107
    Abstract: Novel sulfatase inhibitor/estrogen receptor blocker compounds useful in the treatment of estrogen dependent illnesses are disclosed. The compounds generally comprise a sulfamate moiety and an aromatic, estrogen receptor blocker moiety. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of an estrogen-dependent disease are also disclosed.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: September 11, 2001
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 6262043
    Abstract: Estra-1,3,5(10),16-tetraene derivatives represented by the following formula (I): (wherein R1 represents hydroxy, alkoxy, or NR2R3 (wherein R2 and R3 are the same or different, and each represents hydrogen, straight-chain lower alkyl having 1 to 3 carbon atoms, or branched-chain lower alkyl having 3 to 8 carbon atoms)), or pharmaceutically acceptable salts thereof.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: July 17, 2001
    Assignees: Kyowa Hakko Kogyo Co., Ltd., Duquesne University of the Holy Ghost
    Inventors: Yoji Ino, Nobuyoshi Amishiro, Taisuke Nakata, Hiroyuki Ishida, Shiro Akinaga, Chikara Murakata, Pui-Kai Li
  • Patent number: 6248780
    Abstract: Novel sulfatase inhibitor/estrogen receptor blocker compounds useful in the treatment of estrogen dependent illnesses are disclosed. The compounds generally comprise a sulfamate moiety and an aromatic, estrogen receptor blocker moiety. Methods for synthesizing these compounds and using them in the therapeutic and/or prophylactic treatment of an estrogen-dependent disease are also disclosed.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: June 19, 2001
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 5880115
    Abstract: Sulfatase inhibitor compounds having the formula: ##STR1## wherein X, Y, R.sub.1, R.sub.2 and R.sub.3 are as defined in the specification. The compounds are useful in the treatment of estrogen dependent illnesses. Methods for synthesizing these compounds are also disclosed.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: March 9, 1999
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 5866603
    Abstract: This invention discloses compounds useful as steroid sulfatase inhibitors. The compounds comprise the formula (1) ##STR1## wherein (a) R is selected from the group consisting of hydrogen, a lower alkyl group, an alkoxy group, halogen, NH.sub.2, NO.sub.2, C.tbd.N and N.dbd.C.dbd.S; and (b) the ring system ABCD is a steroid nucleus selected from the group consisting of estrone, dehydroepiandrosterone, estradiols, estradiolesters, pregnenolone, substituted estrones, substituted dehydroepiandrosterones, substituted estradiols, substituted estradiolesters and substituted pregnenolone. The compounds also comprise the formula (5) ##STR2## wherein (a) R.sub.1 is hydrogen and R.sub.2 is selected from the group consisting of SO.sub.2 CF.sub.3, SO.sub.2 NH.sub.2, SO.sub.2 (C.sub.1 -C.sub.6 -alkyl), COCF.sub.3, CONH.sub.2, CO(C.sub.1 -C.sub.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 2, 1999
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 5763492
    Abstract: This invention discloses a method for enhancing memory in a patient comprising administering a compound of formula ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen and a lower alkyl group; m is an integer between about 0 and 4; and n is an integer between about 5 and 14. The methods generally comprise administering an effective amount of the compound. The invention also discloses the enhancement of memory by the use of non-steroidal sulfatase inhibitors of the above formula in conjunction with the naturally occurring neurosteroids dehydroepiandrosterone sulfate (DHEAS) and/or pregnenolone sulfate (PS). The patients benefitting from the methods of the present invention will generally have an illness that causes memory loss, or will be individuals who otherwise want to improve memory.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: June 9, 1998
    Assignee: Duguesne University of the Holy Ghost
    Inventors: David A. Johnson, Pui-Kai Li
  • Patent number: 5677292
    Abstract: This invention discloses compounds useful as steroid sulfatase inhibitors. The compounds comprise the formula (1) ##STR1## wherein (a) R is selected from the group consisting of hydrogen, a lower alkyl group, an alkoxy group, halogen, NH.sub.2, NO.sub.2, C.tbd.N and N.dbd.C.dbd.S; and (b) the ring system ABCD is a steroid nucleus selected from the group consisting of estrone, dehydroepiandrosterone, estradiols, estradiolesters, pregnenolone, substituted estrones, substituted dehydroepiandrosterones, substituted estradiols, substituted estradiolesters and substituted pregnenolone. The compounds also comprise the formula (5) ##STR2## wherein (a) R.sub.1 is hydrogen and R.sub.2 is selected from the group consisting of SO.sub.2 CF.sub.3, SO.sub.2 NH.sub.2, SO.sub.2 (C.sub.1 -C.sub.6 -alkyl), COCF.sub.3, CONH.sub.2, CO(C.sub.1 -C.sub.
    Type: Grant
    Filed: February 27, 1996
    Date of Patent: October 14, 1997
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 5571933
    Abstract: This invention discloses compounds useful as steroid inhibitors. The compounds comprise the formula (5) ##STR1## wherein (a) R.sub.1 is hydrogen and R.sub.2 is selected from the group consisting of SO.sub.2 CF.sub.3, SO.sub.2 NH.sub.2, SO.sub.2 (C.sub.1 -C.sub.6 -alkyl), COCF.sub.3, CONH.sub.2, CO(C.sub.1-C.sub.6 -alkyl); and (b) the ring system ABCD is a steroid nucleus selected from the group consisting of estrone, dehydroepiandrosterone, estradiol, estradiolester, pregnenolone, substituted estrones, substituted dehydroepiandrosterone, substituted estradiols, substituted estradiolesters and substituted pregnenolone. Preferably the steroid nucleus is selected from the group consisting of estrone, dehydropeiandrosterone and pregnenolone. The invention also discloses methods of treating a patient therapeutically and prophylactically for estrogen dependent diseases with the compounds of this invention.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: November 5, 1996
    Assignee: Duquesne University of the Holy Ghost
    Inventors: Pui-Kai Li, Kyle W. Selcer
  • Patent number: 5567831
    Abstract: This invention discloses compounds useful as non-steroidal sulfatase inhibitors. The compounds comprise the formula (1) ##STR1## wherein (a) R.sub.1 is selected from the group consisting of hydrogen and a lower alkyl group, (b) R.sub.2 is selected from the group consisting of H and a lower alkyl group, (c) m is an integer from 0 to 4, and (d) n is an integer from 5 to 14. R.sub.1 is selected from the group consisting of H and C.sub.1 -C.sub.6 alkyl and R.sub.2 is selected from the group consisting of H and C.sub.1 -C.sub.6 alkyl. The invention also discloses methods of treating a patient prophylactically to provide protection as an estrogen depleting agent for estrogen dependent illnesses and treating a patient therapeutically for estrogen dependent diseases. A method of making the non-steroidal sulfatase inhibitors is also disclosed.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: October 22, 1996
    Assignee: Duguesne University of the Holy Ghost
    Inventor: Pui-Kai Li
  • Patent number: 5556847
    Abstract: This invention discloses a method for treating a patient for an illness selected from the group consisting of amnesia, head injuries, Alzheimer's disease, epileptic dementia, presenile dementia, post traumatic dementia, senile dementia, vascular dementia and post stroke dementia or individuals otherwise seeking memory enhancement. The method comprises providing a compound of formula (1) ##STR1## wherein (a) R.sub.1 and R.sub.2 are the same or different and are selected from the group consisting of hydrogen and a lower alkyl group of 1 to 6 carbon atoms and (b) the ring system ABCD is asteroid nucleus selected from the group consisting of estrone, dehydroepiandrosterone, estradiol, estradiolester, pregnenolone, substituted estrone, substituted dehydroepiandrosterone, substituted estradiol, substituted estradiolesters and substituted pregnenolone.
    Type: Grant
    Filed: October 27, 1994
    Date of Patent: September 17, 1996
    Assignee: Duquesne University of the Holy Ghost
    Inventors: David A. Johnson, Pui-Kai Li, Michael E. Rhodes