Patents by Inventor Vedantham Raman

Vedantham Raman 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: 6023840
    Abstract: A single layer wear coating is provided for a magnetic head assembly. The single layer is silicon or silicon-based material with a thickness in the range of 30-75 .ANG.. The single layer may be formed by a single step of deposition employing a DC magnetron. The single layer wear coating improves the wear performance of the magnetic head assembly and protects one or more sensitive elements of a magnetic head without significant reduction of spacing loss.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: February 15, 2000
    Assignee: International Business Machines Corporation
    Inventors: Pei C. Chen, Grace Lim Gorman, Cherngye Hwang, Vedantham Raman, Randall George Simmons
  • Patent number: 5948532
    Abstract: We disclose a bi-layer wear pad, for use in a slider/magnetic media interface, comprising a wear layer and an adhesion layer. The wear material is either carbon or a carbonaceous material. Typical carbonaceous materials useful for wear layers include elements such as hydrogen, fluorine, nitrogen, boron, and silicon dioxide. The adhesion layer is a thin cermet such as nichrome oxide (NiCrOx) or chromium silicon oxide (CrSiOx). Use of the cermet adhesion layer allows a relatively thick wear layer to be deposited with good adhesion and superior durability.
    Type: Grant
    Filed: December 10, 1996
    Date of Patent: September 7, 1999
    Assignee: International Business Machines Corporation
    Inventors: Cherngye Hwang, Vedantham Raman, John Walter Raniseski
  • Patent number: 5943187
    Abstract: A method is provided for applying an overcoat to a slider and sensitive elements of a magnetic head which has improved coverage, reduced spacing loss and improved corrosion resistance. After lapping, an overcoat material is sputter deposited on the air bearing surface (ABS) of the slider, followed by a step of sputter etching the overcoat. The sputter etching redeposits material from high points on the slider and fills in trenches formed during the lapping process. The redeposition of the overcoat from the high places to the low places of the slider decreases the overall thickness of the overcoat, thereby decreasing spacing loss. The filling of the trenches implements increased coverage which increases wear resistance of the slider and more adequately protects the sensitive elements of the magnetic head from corrosion. In a preferred embodiment, a portion of the overcoat is left on the high places to ensure that the sputter etching does not damage the sensitive elements of the magnetic head.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: August 24, 1999
    Assignee: International Business Machines Corporation
    Inventors: Pei C. Chen, Cherngye Hwang, Vedantham Raman, Jila Tabib
  • Patent number: 5808832
    Abstract: A single layer wear coating is provided for a magnetic head assembly. The single layer is silicon or silicon-based material with a thickness in the range of 30-75 .ANG.. The single layer may be formed by a single step of deposition employing a DC magnetron. The single layer wear coating improves the wear performance of the magnetic head assembly and protects one or more sensitive elements of a magnetic head without significant reduction of spacing loss.
    Type: Grant
    Filed: February 27, 1996
    Date of Patent: September 15, 1998
    Assignee: International Business Machines Corporation
    Inventors: Pei C. Chen, Grace Lim Gorman, Cherngye Hwang, Vedantham Raman, Randall George Simmons
  • Patent number: 5661618
    Abstract: The invention relates to an improved high performance magnetic recording device. The recording device comprises a magnetic recording disk, a slider having a transducer for reading or writing data on the disk, a motor operable to rotate the disk at speeds greater than 7000 RPM and an actuator connected to the slider to move the slider across the disk. The trailing surface of the slider is coated with a low surface energy film to prevent build up of droplets of liquid contaminants.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: August 26, 1997
    Assignee: International Business Machines Corporation
    Inventors: Charles Allan Brown, Mark Stephen Crowder, Donald R. Gillis, Andrew Marian Homola, Vedantham Raman, George William Tyndall, III