Patents by Inventor Michael Mallary

Michael Mallary 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: 5311387
    Abstract: The head includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing devices such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution, high write field gradients, and the capability for write wide read narrow. The read pole and write poles are laminated structures.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: May 10, 1994
    Assignee: Digital Equipment Corporation
    Inventor: Michael Mallary
  • Patent number: 5240740
    Abstract: A two-pole inductive magnetic head for a computer disk drive assembly. The head generates a stream of main pulses and secondary pulses in a readback waveform when reading data from a magnetic medium, each bit of read data represented by a respective main pulse. The head includes an integrating feature which reduces the amplitude and high frequency content of the secondary pulses in the readback waveform so as to ease the task of electronically isolating the main pulses for downstream processing of the read data.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: August 31, 1993
    Assignee: Digital Equipment Corporation
    Inventors: Karl A. Frey, Michael Mallary
  • Patent number: 5193039
    Abstract: Method and apparatus for supplying bias to a magnetoresistive element in an encapsulated thin film head for reducing the likelihood of generation of Barkhausen noise when reading flux from a magnetic storage disk. The invention achieves a relatively uniform easy axis bias field in an easy to implement manner by creating a magnetic bias structure on the encapsulated heat at the same time as providing the contact pads for the MR element.
    Type: Grant
    Filed: April 17, 1991
    Date of Patent: March 9, 1993
    Assignee: Digital Equipment Corporation
    Inventors: Alan B. Smith, Michael Mallary
  • Patent number: 5103553
    Abstract: The head includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing devices such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution, high write field gradients, and the capability for write wide-read narrow. The read pole and write poles are laminated structures.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: April 14, 1992
    Assignee: Digital Equipment Corporation
    Inventor: Michael Mallary
  • Patent number: 5089334
    Abstract: A method of flux conduction comprising providing a structure with anisotropy not purely in the transverse in-plane direction such that flux spreading into the transverse in-plane direction can occur by rotation.This method of flux conduction is used in magnetic devices having coupled magnetic layers or coupled magnetic domains. Devices disclosed which utilize this method can function as a magnetic recording head, bubble memory, magnetic field structure, magnetic field sensor, transformer, laminated magnetic memory element or magnetic shield.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: February 18, 1992
    Assignee: Digital Equipment Corporation
    Inventors: Michael Mallary, Harold B. Shukovsky
  • Patent number: 4907113
    Abstract: The head includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing devices such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution, high write field gradients, and the capability for write wide-read narrow. The read pole and write poles are laminated structures.
    Type: Grant
    Filed: July 29, 1987
    Date of Patent: March 6, 1990
    Assignee: Digital Equipment Corporation
    Inventor: Michael Mallary
  • Patent number: 4828966
    Abstract: A method of forming a Hall effect sensor for a magnetic recording head including the steps of providing a single crystal substrate having a chemically dissimilar single crystal film thereon, providing a ceramic substrate having a first magnetic pole piece of a selected thickness formed on a surface thereof, positioning the single crystal substrate and the ceramic substrate with the single crystal film and magnetic pole piece surfaces in an opposing relationship, bonding the positioned ceramic substrate to the single crystal film on the positioned single crystal substrate to form a laminated structure having a substantially thin uniform bond line, removing chemically the single crystal substrate from the single crystal film, forming a Hall effect pattern in the film while one surface of the film is exposed, and depositing a second magnetic pole piece on the formed Hall effect pattern.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: May 9, 1989
    Assignee: Digital Equipment Corporation
    Inventors: Michael Mallary, Christine Bisagni, Shu-Huei Liu