Patents by Inventor Madhukar L. Joshi

Madhukar L. Joshi 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: 5643435
    Abstract: The present invention encompasses a semiconductor processing device having a processing chamber in which is positioned an electrolyte oxygen pump assembly and tubing for transferring an oxygen containing gas from outside the reaction chamber to within the interior of the electrolyte oxygen pump assembly and tubing for removal of the oxygen depleted gas from within the interior of the electrolyte oxygen pump assembly. In addition, the semiconductor processing tool may further have heating elements for heating a semiconductor substrate within the processing chamber independently from heating of the electrolyte.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: July 1, 1997
    Assignee: International Business Machines Corporation
    Inventors: Glenn F. Guhman, Madhukar L. Joshi
  • Patent number: 5611898
    Abstract: The present invention encompasses a semiconductor processing device having a processing chamber in which is positioned an electrolyte oxygen pump assembly and tubing for transferring an oxygen containing gas from outside the reaction chamber to within the interior of the electrolyte oxygen pump assembly and tubing for removal of the oxygen depleted gas from within the interior of the electrolyte oxygen pump assembly. In addition, the semiconductor processing tool may further have heating elements for heating a semiconductor substrate within the processing chamber independently from heating of the electrolyte.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: March 18, 1997
    Assignee: International Business Machines Corporation
    Inventors: Glenn F. Guhman, Madhukar L. Joshi
  • Patent number: 4216573
    Abstract: A three mask method is provided for making a field effect transistor which includes the use of a first mask for defining first and second spaced apart diffusion regions, each having first and second ends, a second mask for defining a contact region at the first end of the first and second diffusion regions and for defining a protected region at the gate region and source and drain electrodes of the transistor, the protected region extending between the second ends of the first and second diffusion regions, and a third mask for forming a gate electrode within the protected region and contact electrodes in the contact region. The source and drain electrodes are formed between the gate electrode and the first and second diffusion regions by ion implantation techniques.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: August 12, 1980
    Assignee: International Business Machines Corporation
    Inventors: Madhukar L. Joshi, Richard K. Mason, Wilbur D. Pricer
  • Patent number: 4168536
    Abstract: A memory is produced which has a series circuit including charge storage means, an impedance and switching means and an amplifier having an input connected to the series circuit at a point between the charge storage means and the impedance and an output coupled to a bit/sense line. The switching means is controlled by a pulse from a word line. The series circuit interconnects the bit/sense line and a point of reference potential. In a preferred embodiment, the switching means is a first field effect transistor having its gate electrode connected to the word line and the amplifier is a second field effect transistor having its gate electrode connected to the series circuit at a point between the charge storage means and the impedance and having one of its current carrying electrodes coupled to the bit/sense line and its other current carrying electrode coupled to a point of reference potential.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: September 18, 1979
    Assignee: International Business Machines Corporation
    Inventors: Madhukar L. Joshi, Wilbur D. Pricer
  • Patent number: 4123300
    Abstract: A method for making high density integrated circuits which utilizes lift-off techniques provides a structure having a single layer of insulating material for both the dielectric of a storage capacitor and the insulator for a gate or control electrode of a switching element. The steps of the method include forming a thin layer of silicon dioxide on a silicon substrate followed by a layer of first doped polysilicon and, optionally, a layer of silicon nitride and then a layer of photoresist. The layers are etched to the silicon dioxide surface with the exception of the portion of the layers overlying a region defined as the gate or control electrode of the switching element. A second layer of doped polysilicon is then deposited over the remaining structure to provide on the silicon dioxide layer a second conductive layer adjacent to but spaced from the first polysilicon layer forming the gate or control electrode.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: October 31, 1978
    Assignee: International Business Machines Corporation
    Inventors: Madhukar L. Joshi, Paul F. Landler, Ronald Silverman
  • Patent number: 4049478
    Abstract: A substantially square N-type impurity distribution profile in a silicon substrate produces much superior dc and ac characteristics in PN junction devices than can be expected from the usual phosphorus distribution profile. Such a square profile is obtained by diffusion of arsenic in the silicon substrate. The sharper impurity gradient allows a relatively low surface concentration to be used for the device. This lower surface concentration relieves precipitation and dislocation problems.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: September 20, 1977
    Assignee: IBM Corporation
    Inventors: Hitendra N. Ghosh, Madhukar L. Joshi, Tsu-Hsing Yeh