Patents by Inventor Rolf Staiger

Rolf Staiger 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 reducing the phenol content in phenol-containing waters
    Patent number: 4857207
    Abstract: A process for the purification of phenol-containing waters, in particular waste waters from phenolic resin production, where the term "phenol" is taken to mean all steam-volatile benzene derivatives according to DIN 38,409 H 16, by reaction of the phenol with formaldehyde in an alkaline environment at 50.degree. to 100.degree. C. to form those phenolformaldehyde condensates which, by subsequent acidification of the waste water, precipitate in filterable, granular and no longer sticky form and can be separated.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: August 15, 1989
    Assignee: Hoechst AG
    Inventors: Ulrich Hars, Rolf Staiger, Karl Westphal