Patents by Inventor Leonard Evans James

Leonard Evans James 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 preparing polyesters
    Patent number: 4097468
    Abstract: In a process for the preparation of high molecular weight linear polyesters of terephthalic acid which comprises partially esterifying terephthalic acid with an alkylene glycol under direct esterification conditions and then further esterifying and polycondensing the partially esterified product, the molecular weight distribution of the polyester is narrowed by correlating the carboxyl conversion with the reacted glycol to terephthalic acid mol ratio in various steps of a multistep process.
    Type: Grant
    Filed: March 15, 1977
    Date of Patent: June 27, 1978
    Assignee: Allied Chemical Corporation
    Inventors: Leonard Evans James, Laszlo Joseph Balint, Stanley David Lazarus