Patents by Inventor Raj T. Nagarajan

Raj T. Nagarajan 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).

  • Solenoid actuated miniservo spool valve
    Patent number: 5720318
    Abstract: A valve includes a housing having a high pressure inlet, a low pressure inlet, an outlet and first and second sealing surfaces. A pilot valve is disposed in the housing and includes a valve element movable between first and second positions. A movable spool is also disposed in the housing and includes third and fourth sealing surfaces engagable with the first and second sealing surfaces, respectively, carried by the housing to connect the outlet to the low pressure inlet when the valve element is in the first position and to connect the outlet to the high pressure inlet when the valve element is in the second position.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: February 24, 1998
    Assignee: Caterpillar Inc.
    Inventors: Raj T. Nagarajan, Charles R. Miller, Craig W. Lohmann
  • Direct-operated spool valve for a fuel injector
    Patent number: 5597118
    Abstract: An actuation valve for a hydraulically-operated fuel injector includes an actuator having a plunger and a spool valve coupled to the plunger. The spool valve includes a high pressure port and is operable by the actuator to selectively place the high pressure port or the low pressure port in fluid communication with an injection mechanism of the injector.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: January 28, 1997
    Assignee: Caterpillar Inc.
    Inventors: Jeffrey J. Carter, Jr., Howard N. Cannon, Kirk S. Shively, Glen F. Forck, Raj T. Nagarajan, Steven F. Meister