Patents by Inventor Hans Langenfelder

Hans Langenfelder 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).

  • Production of aqueous suspensions of finely divided titanium dioxide
    Patent number: 4474681
    Abstract: Aqueous suspensions of finely divided titanium dioxide are produced in the presence of dispersants by a process in which titanium dioxide powder and caprolactam are kneaded together in the dry state at from 15.degree. to 40.degree. C., the resulting mixture is kneaded with the addition of water, the paste thus obtained is suspended in water, the suspension is then allowed to sediment, and the resulting suspension containing finely divided titanium dioxide is decanted.
    Type: Grant
    Filed: July 2, 1982
    Date of Patent: October 2, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Belde, Hans Langenfelder, Werner Hoerauf
  • Flowable aqueous pigment formulations containing dipropylene glycol
    Patent number: 3966488
    Abstract: Aqueous pigment formulations containing glycol and having good flow, good water retention and good flocculation resistance which contain dipropylene glycol as a flow improver. The formulations are particularly suitable for pigmenting aqueous polymer dispersions and textile pigment printing and dope dyeing.
    Type: Grant
    Filed: January 30, 1974
    Date of Patent: June 29, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Langenfelder, Ewald Daubach, Horst Belde