Patents by Inventor Pyung K. Yu

Pyung K. Yu 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: 4178169
    Abstract: Compounds of the formula ##STR1## wherein X is hydrogen, halogen, trifluoromethyl, or nitroX.sup.1 is hydrogen, halogen, trifluoromethyl, cyano, carbamoyl, alkyl, alkoxy, alkoxycarbonyl, alkylcarbonyl, alkylsulfonyl, or amino,Y is --S--, --SO--, or --SO.sub.2 --,Z is hydrogen or alkyl andZ.sup.1 is carboxy, or a salt thereof, carbalkoxy, cyano or carbzmoyl,are useful in regulating the growth of plants when applied to the plant, plant habitat, or plant seeds.
    Type: Grant
    Filed: May 12, 1978
    Date of Patent: December 11, 1979
    Assignee: Rohm and Haas Company
    Inventors: Robert H. Meisinger, Pyung K. Yu
  • Patent number: 4124370
    Abstract: Diphenyl ethers having the formula ##STR1## WHERE Y and Z are halogen, alkyl, trifluoromethyl, alkoxy, hydroxy, nitro, cyano, carboxy, carbalkoxy, carbamoyl, or alkylthio, andm and n are 0, 1, 2, or 3,Are useful in controlling undesirable secondary growth in plants, particularly sucker growth in tobacco.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: November 7, 1978
    Assignee: Rohm and Haas Company
    Inventor: Pyung K. Yu
  • Patent number: 4009021
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 and R.sup.2 are halogen, alkyl, alkoxy, trifluoromethyl or nitro,R.sup.3 and R.sup.4 are hydrogen or alkyl, andn and m are 0, 1, or 2,Are useful in regulating the growth of plants when applied to the plant, plant habitat, or plant seeds.
    Type: Grant
    Filed: October 30, 1975
    Date of Patent: February 22, 1977
    Assignee: Rohm and Haas Company
    Inventors: Roy Y. Yih, Pyung K. Yu