Patents by Inventor S. Raghuma Reddy

S. Raghuma Reddy 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).

  • Compartmental evaporative canister and pressure control valve assembly
    Patent number: 5148793
    Abstract: A fuel vapor storage canister to prevent breakthrough evaporative emission loss and facilitate purging by concentrating the fuel vapor close to the vent to the engine. The canister is divided into two compartments which communicate through a connective means that only allows vapor into the second compartment when a control valve, located in the connective means, opens at a threshold pressure.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: September 22, 1992
    Assignee: General Motors Corporation
    Inventor: S. Raghuma Reddy
  • Vehicle fuel tank pressure control method
    Patent number: 5021071
    Abstract: Vehicle tank pressure is controlled by adsorbing air from the tank in a zeolite bed, and passing fuel vapor back to the tank. The zeolite is later regenerated by application of heat and vacuum.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: June 4, 1991
    Assignee: General Motors Corporation
    Inventor: S. Raghuma Reddy
  • Vehicle fuel system with reduced tank heating
    Patent number: 4989572
    Abstract: Warmed returned fuel from a vehicle fuel injection system is returned only a segregating canister in the tank, and pumped back therefrom preferentially, with make up fuel allowed in only as needed. Overall heating of the stored fuel, and consequent running losses, are substantially reduced, with no ill effects on vehicle operation.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: February 5, 1991
    Assignee: General Motors Corporation
    Inventors: Roy A. Giacomazzi, S. Raghuma Reddy, Gregory E. Rich
  • Evaporative emission control system
    Patent number: 4886096
    Abstract: An improved evaporative emission control system uses a charcoal canister, but, rather than air purging the canister of stored vapors, desorbs them, substantially without air, by application of a vaccum and reabsorbs the purged vapors into the liquid fuel in the tank. Any effect on driveability and exhaust emissions is thereby avoided, and canister capacity and efficiency are increased.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: December 12, 1989
    Assignee: General Motor Corporation
    Inventor: S. Raghuma Reddy