Patents by Inventor Laszlo Szommer

Laszlo Szommer 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).

  • Method of preparation of unsaturated polyester resins from maleic acid/anhydride
    Patent number: 4902773
    Abstract: The invention relates to the acceleration of the synthesis of unsaturated polyesters containing maleic acid/anhydride, 1 to 30 percent, preferably 5 to 15 percent of the prescribed maleic acid/anhydride is introduced into the reaction mixture in total or in two or more increments at the stage of the reaction when the acid number or the molecular weight of the mixture has reached about 50 to 250 or about 300 to 1500, respectively. Thus, the rate of polyesterification can be increased considerably, occasionally two-folds and, in addition, polyester resins of very low acid number or high molecular weight can be prepared.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: February 20, 1990
    Assignee: Nitrokemia Ipartelepek
    Inventors: Akos Bodnar, Maria Solymoss, Ibolya Vancson Szmercsanyi, Istvan Szigeti, Laszlo Szommer