Patents by Inventor Ate K. Damstra

Ate K. Damstra 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).

  • Shaving apparatus with controllable motor speed
    Patent number: 5671535
    Abstract: A shaving apparatus (1, 101, 201) is provided which includes at least one cutting unit (11) which is provided with an external cutting member (13) with at least one hair trap opening (17) and with an internal cutting member (19) which is rotatable in the external cutting member (13) by means of an electric motor (23). The speed of the motor (23) can be controlled during operation by a feedforward control unit (43, 103, 203) as a function of at least one physical quantity which can be measured during operation by means of a transducer (59, 69, 111).A first embodiment of the shaving apparatus (1) comprises a timer (59) which measures a time which has elapsed during a shaving operation, and a detector (69) with a microphone (71) which measures a cutting frequency of the cutting unit (11), the speed of the motor (23) being controllable by the control unit (43) as a function of the time which has elapsed during the shaving operation and of the cutting frequency.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: September 30, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Albertus J. C. Van Der Borst, Jan Tiesinga, Jacobus N. Dekker, Ate K. Damstra
  • Vacuum cleaner and suction tube for use with a vacuum cleaner
    Patent number: 5363534
    Abstract: A vacuum cleaner is provided which comprises a housing (100) provided with an electric motor (110) and with an electronic circuit (120) for controlling the electric motor (110), which housing (100) is constructed for the connection of a suction tube (200) with a remote control circuit (210) for controlling the electronic circuit (120), the electronic circuit (120) being adapted to control the electric motor (110) both in the presence and in the absence of the suction tube (200).
    Type: Grant
    Filed: May 25, 1993
    Date of Patent: November 15, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Jan H. Dekker, Ate K. Damstra
  • Circuit arrangement for deriving a direct voltage from the mains alternating voltage
    Patent number: 4959556
    Abstract: A circuit arrangement for deriving a direct voltage from an alternating voltage, particularly the mains alternating voltage. The circuit arrangement includes a switching transistor (T1) whose main current path is connected via a rectifier diode (D1) between the input and the output and whose control electrode is controlled by a thyristor (Th). The gate electrode of the thyristor is connected via a diac (D3) to a time-determining circuit comprising a series arrangement of a resistor (R1) and a capacitor (C1). A diode (D2) is arranged across the capacitor in such a way that the diode (D2) conducts during the periods when the rectifier diode (D1) is blocked.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: September 25, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Jan H. Dekker, Ate K. Damstra
  • Optical indicator device
    Patent number: 4672367
    Abstract: An optical indication circuit in which a light-emitting diode is included in the feed current path of an IC which is energized via a dissipation resistor and a rectifier diode directly from the alternating voltage supply.
    Type: Grant
    Filed: January 27, 1984
    Date of Patent: June 9, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Ate K. Damstra