Patents by Inventor Petrus J. Bremer

Petrus J. Bremer 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).

  • Hair-care appliance with hair-moistness measurement by measuring the resistance of the hair, and circuit for converting the resistance value of a resistor into a measurement signal
    Patent number: 5857379
    Abstract: A hair-care appliance measures the moistness of the hair by measuring the resistance (R.sub.x) of the hair between measurement electrodes (14A/14B). The hair resistance (R.sub.x) is included in a T network comprising a first resistor (20) driven by a voltage source (28) and a second resistor (24). The signal current (I.sub.s) through the second resistor is measured and converted into a measurement signal (MS) by a converter (30). As a result of the use of the T network a comparatively large resistance variation of the hair resistance (R.sub.x) is required for a given amplitude variation in the signal current (I.sub.s). This allows measurements over a wider resistance range while the resolution is maintained.
    Type: Grant
    Filed: September 11, 1996
    Date of Patent: January 12, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Klaas J. Lulofs, Petrus J. Bremer