Patents by Inventor Siegfried Lang

Siegfried Lang 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).

  • Biodegradable vinylpyrrolidone polymers, their manufacture and use
    Patent number: 4254239
    Abstract: High molecular weight products based on N-vinylpyrrolidone, in which blocks of vinylpyrrolidone polymers or vinylpyrrolidone copolymers are linked by connecting units carrying ester, amide, urethane or urea groups, as a result of which these high molecular weight products are biodegradable and may be used as plasma substitutes, and the plasma substitutes thus obtained.
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: March 3, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Ferdinand Straub, Hans-Uwe Schenck, Siegfried Lang, Egon Brode