Patents by Inventor Albrecht Wilhelm Friederang

Albrecht Wilhelm Friederang 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 production of aqueous solutions of free hydroxylamine
    Patent number: 5837107
    Abstract: An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at .ltoreq.80.degree.0 C. The novel process can be carried out in a simple and gentle manner and on a large industrial scale. Owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process, the risk of decomposition is minimized.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: November 17, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Otto Watzenberger, Hans-Michael Schneider, Bernd Leutner, Albrecht Wilhelm Friederang