Patents by Inventor Keshava B. Kumar

Keshava B. Kumar 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).

  • Publication number: 20030086805
    Abstract: A screw machine (10) has a rotor housing (12) defining overlapping bores (12-1, 12-2). Female rotor (14) is located in bore (12-1) and male rotor (16) is located in bore (12-2). A wear resistant coating is deposited on the tips (14-1, 16-1) of the rotors. A conformable coating is deposited on the valleys (14-2, 16-2) of the rotors. A conformable coating is depsoited on the surface of the bores coacting with the rotors.
    Type: Application
    Filed: December 2, 2002
    Publication date: May 8, 2003
    Inventors: James W. Bush, Clark V. Cooper, Ronald T. Drost, Hong Du, Harry E. Eaton, Hussein E. Khalifa, Keshava B. Kumar, Reng Rong Lin, Philip H. McCluskey, Raymond DeBlois, Paula R. DeBlois
  • Patent number: 6506037
    Abstract: A screw machine (10) has a rotor housing (12) defining overlapping bores (12-1, 12-2). Female rotor (14) is located in bore (12-1) and male rotor (16) is located in bore (12-2). A wear resistant coating is deposited on the tips (14-1, 16-1) of the rotors. A conformable coating is deposited on the valleys (14-2, 16-2) of the rotors. A conformable coating is depsoited on the surface of the bores coacting with the rotors.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: January 14, 2003
    Assignee: Carrier Corporation
    Inventors: James W. Bush, Clark V. Cooper, Ronald T. Drost, Hong Du, Harry E. Eaton, Hussein E. Khalifa, Keshava B. Kumar, Reng Rong Lin, Philip H. McCluskey, Raymond DeBlois
  • Patent number: 6167771
    Abstract: Zero clearance screw rotor profiles are modified by determining clearance requirements at spaced points on the profiles and varying the clearance distribution between adjacent points using a non-linear distribution. Additionally, when the clearances are put in the rotors, zero clearance is maintained between the rotors in the contact band which is maintained near the pitch circle.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: January 2, 2001
    Assignee: Carrier Corporation
    Inventors: Keshava B. Kumar, James W. Bush
  • Patent number: 6139299
    Abstract: The point of tangency of the tip circle of the male rotor and the root circle of the female rotor is used as a starting point in generating the series of curves defining the male and female conjugate rotor profiles. The present invention provides: reduced viscous drag through the use of a departure angle; strengthened female lobes by controlling thickness along the pitch circle; opened root of male rotor to enhance manufacturability and tool life; a tortuous leakage path for gas traveling from a high pressure thread to a low pressure thread; better control of root diameter; and control of the pressure angle independently of the other variables.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: October 31, 2000
    Assignee: Carrier Corporation
    Inventors: Keshava B. Kumar, James W. Bush
  • Patent number: 5370156
    Abstract: The profile of the valve stop of a discharge valve is configured such that the portion facing the free length of the valve member has an increasing radius portion and a decreasing radius portion.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: December 6, 1994
    Inventors: Aldo A. Peracchio, Mark E. Marler, Keshava B. Kumar