Patents by Inventor Helmut Auweter

Helmut Auweter 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 acicular ferromagnetic material consisting essentially of iron-containing chromium dioxide
    Patent number: 5030371
    Abstract: An acicular, ferromagnetic material which has a high coercive force and essentially consists of iron-containing chromium dioxide is prepared by thermal decomposition of hydrated chromium(III) chromate under superatmospheric pressure.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: July 9, 1991
    Assignee: BASF
    Inventors: Michael W. Mueller, Ekkehard Schwab, Helmut Auweter, Rainer Feser, Rudi Lehnert, Norbert Mueller, Manfred Ohlinger
  • Fiber-optical sensor
    Patent number: 5011279
    Abstract: In a fiber-optical sensor used for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS), the scattered light originating from particles in movement, the emergence surface (7) for the laser light at the end of a single-mode or multimode light guide (3) used as an immersion probe is inclined at an angle 0<.phi..ltoreq.15.degree., preferably 1.degree..ltoreq..phi..ltoreq.6.degree., the angle of inclination being de-fined by the optical axis (8) of the light guide (3) and the normal (9) of the emergence surface (7).
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: April 30, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Auweter, Dieter Horn, Dieter Lilge, Juergen Wortmann
  • Acicular, ferromagnetic metal particles essentially consisting of iron, and their preparation
    Patent number: 4960462
    Abstract: Acicular, ferromagnetic metal particles which essentially consist of iron and have a nickel content of not more than 0.4% by weight and high values for coercive force and magnetization, and a process for the preparation of these particles. The particles further include zinc, phosphorus in the form of phosphate ions, and silicon in the form of SiO.sub.2.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: October 2, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael W. Mueller, Kalus-Dieter Hoppe, Ekkehard Schwab, Werner Steck, Helmut Auweter, Rainer Feser
  • Preparation of acicular .alpha.-Fe.sub.2 O.sub.3
    Patent number: 4913890
    Abstract: Finely divided acicular and pore-free .alpha.-Fe.sub.2 O.sub.3 is prepared from an iron(III) salt in the presence of one or more organic substances which form complexes with iron(III) ions, in alkaline supension at from 80.degree. to 250.degree. C., and is used for the preparation of magnetic materials suitable for magnetic recording media.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: April 3, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Volker Arndt, Helmut Auweter, Rainer Feser, Ekkehard Schwab
  • Fiber-optical Doppler anemometer
    Patent number: 4637716
    Abstract: In a fiber-optical Doppler anemometer for measurement of fluctuating light or the Doppler broadening of laser light scattered by a scattering medium, for example by particles in motion, coherent laser light is passed via a fiber-optical coupler (1) and a submerged fiber-optical probe (2) into the scattering medium, and the light scattered back by the scattering medium is picked up by the submerged fiber-optical probe (2), branched by the fiber-optical coupler (1) and passed to a photodetector (3).
    Type: Grant
    Filed: September 20, 1983
    Date of Patent: January 20, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Auweter, Dieter Horn, Erik Lueddecke