Patents by Inventor Nicolai W. Christie

Nicolai W. Christie 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).

  • Patent number: 5947410
    Abstract: A tensioning device loaded tape transversal tension control device and method are provided to equalize tape tension across a transverse cross-section of a tape to provide a more stable tension throughout the tape such that a reduction in maximum tape tension can be achieved. The device includes a central tensioning device and an outer tensioning device for rotationally balancing tape tension by pivoting the device under tensioning device force to press onto or retract from portions of the tape.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: September 7, 1999
    Assignee: Tandberg Data ASA
    Inventor: Nicolai W. Christie
  • Patent number: 5881960
    Abstract: A cartridge position fixing arrangement within a tape drive reduces vibration of the cartridge by fixing the vertical positioning of the tape reel axles between top mounted retaining springs pressing directly onto the cartridge above the reel axles in opposition to the tape drive motors engaging lower ends of the reel axles for rotating the axles. Each hub axle is journaled with a relatively high force at a bearing that may be formed in the upper wall of the cartridge. A reel axle locking arrangement is provided which, when the cartridge is unloaded from the tape drive, locks the position of each reel axle and centers each reel axle properly for future engagement with motor spindles of the tape drive. In one embodiment, a planar engagement between each motor spindle and each reel axle is provided.
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: March 16, 1999
    Assignee: Tandberg Data A/S/A
    Inventor: Nicolai W. Christie
  • Patent number: 5868350
    Abstract: A spring loaded tape transversal tension control device is provided to equalize tape tension across the transverse cross-section of a tape to provide a more stable tension throughout the tape such that a reduction in maximum tape tension can be achieved. The device includes a central spring and an outer spring for rotationally balancing tape tension by pivoting the device under spring force to press onto, or retract from portions of the tape.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: February 9, 1999
    Assignee: Tandberg Data ASA
    Inventor: Nicolai W. Christie
  • Patent number: 5257148
    Abstract: For the accurate positioning of a magnetic head to a track of a moving recording medium in a magnetic layer memory system, particularly a magnetic tape recorder, whereby a magnetic head is displaceable to different tracks in the transverse direction of the recording medium, signals are respectively recorded in tracks that are formed of two sub-tracks separate from one another by a narrow space. A write head that contains two write sub-heads separate from one another by a gap is provided for this purpose. The signals are read from the sub-tracks by two read sub-heads provided in a read head, whereby the respective read sub-heads are fashioned shorter in the transverse direction of the recording medium than the respective sub-tracks. Dependent on read signals of the two read sub-heads, the magnetic head is displaced in the transverse direction of the recording medium such that the magnetic head follows the track with optimum precision.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: October 26, 1993
    Assignee: Tandberg Data AS
    Inventors: Erik Solhjell, Nicolai W. Christie