Patents by Inventor Hemmige V. Rangachar

Hemmige V. Rangachar 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: 5495521
    Abstract: Access of a user to a resource, such as a telecommunications network, includes storing, in a first call data base, a first set of attributes concerning an ongoing call from a caller. A second call data base stores a second set of attributes concerning the history of prior calls made by the caller. A rules data base stores rules concerning attributes for determining whether to disconnect the call, block future calls, or take other action. A determination is made whether data in at least one of the call data bases matches the rules in the rules data base. The call is then disconnected, the next call blocked, or other action is taken, in response to a match between data the call data bases and data in the rules data base. Preferably, the second call data base is updated in response to matches with the rules data base.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: February 27, 1996
    Assignee: AT&T Corp.
    Inventor: Hemmige V. Rangachar
  • Patent number: 4649061
    Abstract: Method and apparatus for depositing a layer of oxide-cathode precursor material on a cathode substrate includes passing a slurry of precursor material from a pool of slurry in a closed pressurized vessel through a tubular means to an air spray gun, wherein the tubular means presents a predetermined resistance to the flow of slurry. Compressed gas flowing through the gun produces a fluctuating siphon pressure in the tubular means and produces a spray of slurry which is scanned across the substrate. The flow resistance in the tubular means dampens the fluctuating component of the siphon pressure while the pressure in the vessel overcomes the flow resistance, controls the slurry flow rate, and makes the flow rate less susceptible to variation due to other factors.
    Type: Grant
    Filed: May 22, 1985
    Date of Patent: March 10, 1987
    Assignee: RCA Corporation
    Inventor: Hemmige V. Rangachar
  • Patent number: 4400233
    Abstract: An etch line for etching apertures in a sheet of material is controlled by measuring the energy transmission capabilities of the apertures immediately after initially rinsing the sheet. A second energy transmission capability measurement is made after the sheet is fully dried. The results of the two measurements are combined to produce a predicted transmission signal which is used to control a parameter of the etching process.
    Type: Grant
    Filed: November 12, 1982
    Date of Patent: August 23, 1983
    Assignee: RCA Corporation
    Inventors: Hemmige V. Rangachar, Kenneth D. Powell