Patents by Inventor Kreisler S. Y. Lau

Kreisler S. Y. Lau 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).

  • Diethynylated phenylbenzimidazole compounds
    Patent number: 4587315
    Abstract: A diethynylated phenylbenzimidazole compound having the formula: ##STR1## where Y is phenyl, cyclohexyl, adamantyl or phenoxylatedphenyl of the formula C.sub.6 H.sub.5 (OC.sub.6 H.sub.4)n (n=1 to 3) and where R1, R2 and R3 are ethynyl, phenoxyethynyl, phenylethynyl, or hydrogen, and further wherein at least one of said R1, R2 or R3 is not hydrogen. The compounds can be cured to form thermoset polymers which are stable at temperatures above 300.degree. C.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: May 6, 1986
    Assignee: Hughes Aircraft Company
    Inventor: Kreisler S. Y. Lau
  • Diethynylated phenylbenzimidazole compounds
    Patent number: 4537974
    Abstract: A diethynylated phenylbenzimidazole compound having the formula: ##STR1## where Y is phenyl, cyclohexyl, adamantyl or phenoxylatedphenyl of the formula C.sub.6 H.sub.5 (OC.sub.6 H.sub.4)n (n=1 to 3) and where R1, R2 and R3 are ethynyl, phenoxyethynyl, phenylethynyl, or hydrogen, and further wherein at least one of said R1, R2 or R3 is not hydrogen. The compounds can be cured to form thermoset polymers which are stable at temperatures above 300.degree. C.
    Type: Grant
    Filed: September 26, 1984
    Date of Patent: August 27, 1985
    Assignee: Hughes Aircraft Company
    Inventor: Kreisler S. Y. Lau
  • Process for preparing ethynylated benzoic acid derivatives
    Patent number: 4465833
    Abstract: A novel ethynylation process is disclosed which provides an expanded series of novel ethylnyl-terminated aromatic compounds having base sensitive substituents and which facilitates the economic preparation of prior art ethynyl-substituted aromatic compounds.
    Type: Grant
    Filed: October 15, 1980
    Date of Patent: August 14, 1984
    Assignees: Hughes Aircraft Company, Hughes Aircraft Company
    Inventors: Kreisler S. Y. Lau, Robert H. Boschan
  • Synthesis of bis(ethynylphenyl) compounds
    Patent number: 4374291
    Abstract: Bis(ethynylphenyl) compounds are prepared by an improved synthesis process which increases yield and is suitable for large scale synthesis operations. Aromatic dianilines are diazotized to form aromatic halides that are subsequently coupled with an end-protecting group having acetylenic moieties. The end-protecting groups are subsequently removed leaving the desired diethynyl derivative in quantitative yields.
    Type: Grant
    Filed: November 6, 1981
    Date of Patent: February 15, 1983
    Assignee: Hughes Aircraft Company
    Inventor: Kreisler S. Y. Lau
  • Synthesis of bis(aminophenyl) compounds
    Patent number: 4370501
    Abstract: A simplified process for converting bis-phenols to dianilines is disclosed. Selected catalytic complexes are used to cause a nucleophilic displacement reaction between a bis-phenol and a quinazoline to occur thereby yielding a bis-quinazoline that may be subsequently converted into a bis-quinazolinone and hydrolyzed to form the desired dianiline.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: January 25, 1983
    Assignee: Hughes Aircraft Company
    Inventor: Kreisler S. Y. Lau