Patents by Inventor Yulin Hu

Yulin Hu 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: 6262319
    Abstract: A process and intermediate compounds for the preparation of fluoroolefin compounds which are useful as pesticidal agents.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: July 17, 2001
    Assignee: American Cyanamid Co.
    Inventors: Keith Douglas Barnes, Yulin Hu, David Allen Hunt
  • Patent number: 6207846
    Abstract: The present invention provides an improved process and intermediate compounds for the preparation of di-fluorovinylsilane insecticidal and acaricidal agents of the formula I wherein Ar is phenyl, 1- or 2-napthyl or a 5- or 6-membered heteroaromatic ring, each of which may be optionally substituted by any combination of from one to three halogen, C1-C4alkyl, C1-C4haloalkyl, C1-C4alkoxy, C1-C4haloalkoxy, C(O)R2 or S(O)nR3 groups, R and R1 are each independently C1-C4 alkyl or C3-C5 cycloalkyl; Ar1 is phenoxyphenyl, phenyl, biphenyl; phenoxypyridyl, benzylpyridyl, benzylphenyl, 1- or 2- napthyl or a 5- or 6-membered heteroaromatic ring, each of which may be optionally substituted by any combination of from one to five halogen, C1-C4alkyl, C1-C4haloalkyl, C1-C4alkoxy, C1-C4haloalkoxy or C(O)R4 groups, n is an integer of 0, 1 or 2; R2 and R4 are each independently C1-C4alkyl, benzyl or phenyl; R3 is C114 C4alkyl or C1 -C4haloalkyl; and the fluorine atoms attached to the double bond are tra
    Type: Grant
    Filed: July 2, 1999
    Date of Patent: March 27, 2001
    Assignee: American Cyanamid Co.
    Inventors: Keith D. Barnes, Yulin Hu
  • Patent number: 6159956
    Abstract: The present invention provides an improved process and intermediate compounds for the preparation of difluorovinylsilane insecticide and acaricidal agents of the formula I ##STR1## wherein Ar is phenyl, 1- or 2-napthyl or a 5- or 6-membered heteroaromatic ring, each of which may be optionally substituted by any combination of from one to three halogen,C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 alkoxy, haloalkoxy, C(O)R.sub.2 or S(O).sub.n R.sub.3 groups,R and R.sub.1 are each independently C.sub.1 -C.sub.4 alkyl or C.sub.3 -C.sub.5 cycloalkyl;Ar.sub.1 is phenoxyphenyl, phenyl, biphenyl, phenoxypyridyl, benzylpyridyl, benzylphenyl,1- or 2-napthyl or a 5- or 6-membered heteroaromatic ring, each of which may be optionally substituted by any combination of from one to five halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkoxy or C(O)R.sub.4 groups,n is an integer of 0, 1 or 2;R.sub.2 and R.sub.4 are each independently C.sub.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: December 12, 2000
    Assignee: American Cyanamid Co.
    Inventors: Keith D. Barnes, Yulin Hu
  • Patent number: 5998673
    Abstract: Pesticidal 1,4-diaryl-2-fluoro-2-butene compounds having the structural formula I ##STR1## and compositions and methods comprising those compounds for the control of insect and acarid pests.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: December 7, 1999
    Assignee: American Cyanamid Company
    Inventors: Keith D. Barnes, Yulin Hu
  • Patent number: 5892131
    Abstract: A process and intermediate compounds for the preparation of fluoroolefin compounds which are useful as pesticidal agents.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: April 6, 1999
    Assignee: American Cyanamid Company
    Inventors: Keith Douglas Barnes, Yulin Hu, David Allen Hunt
  • Patent number: 5849958
    Abstract: Pesticidal 1,4-diaryl-2-fluoro-2-butene compounds having the structural formula I ##STR1## and compositions and methods comprising those compounds for the control of insect and acarid pests.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: December 15, 1998
    Assignee: American Cyanamid Company
    Inventors: Keith D. Barnes, Yulin Hu
  • Patent number: 5817691
    Abstract: There are provided arylthio, -sulfinyl and -sulfonyl pyrrole compounds having the structural formula I ##STR1## Further provided are compositions and methods comprising those compounds for the control of insects.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: October 6, 1998
    Assignee: American Cyanamid Company
    Inventors: Keith Douglas Barnes, Robert Eugene Diehl, Susan Hensen Trotto, Yulin Hu
  • Patent number: 5710102
    Abstract: Difluorovinylsilane compounds having the structural formula I ##STR1## and compositions thereof, and methods for the control of insect and acarid pests and protection of plants.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: January 20, 1998
    Assignee: American Cyanamid Company
    Inventors: Keith Douglas Barnes, Yulin Hu
  • Patent number: 5171676
    Abstract: The fungus Beauveria sulfurescens has been employed to introduce hydroxyl groups into artemisinin and derivatives of artemisinin, an antimalarial. Hydroxylated derivatives of artemisinin and derivatives of artemisinin produced thereby possess antimalarial activity, and can serve as intermediates in the synthesis of further derivatives useful in treating malaria.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: December 15, 1992
    Assignee: The United States of America as represented by the Secretary of the Department of Health and Human Services
    Inventors: Herman Ziffer, Yulin Hu