Patents by Inventor Premysl Silhavy

Premysl Silhavy 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).

  • Process for producing cinnamic acid from 1,1,1,3-tetrachloro-3-phenylpropane
    Patent number: 4806681
    Abstract: This invention relates to a process for preparing cinnamic acid by hydrolysis of 1,1,1,3-tetrachloro-3-phenylpropane with acetic acid, trifluoroacetic acid or formic acid, optionally in the presence sulphuric acid, phosphoric acid, para-toluenesulphonic acid, or a cation exchange resin containing sulphonic acid groups. The mixture is heated at a temperature from about 80.degree. to about 150.degree. C. until hydrogen chloride evolution ceases, after which time the cinnamic acid is separated.
    Type: Grant
    Filed: June 4, 1987
    Date of Patent: February 21, 1989
    Assignee: Ceskoslovenska akademie ved
    Inventors: Milan Hajek, Premysl Silhavy