Patents by Inventor Dah Y. Cheng

Dah Y. Cheng 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).

  • Noise suppressor for turbo fan jet engines
    Patent number: 4372110
    Abstract: A noise suppressor for installation on the discharge or aft end of a turbo fan engine. Within the suppressor are fixed annular airfoils which are positioned to reduce the relative velocity between the high temperature fast moving jet exhaust and the low temperature slow moving air surrounding the same. Within the suppressor nacelle is an exhaust jet nozzle which constrains the shape of the jet exhaust to a substantially uniform elongate shape irrespective of the power setting of the engine. Fixed ring airfoils within the suppressor nacelle therefore have the same salutary effects irrespective of the power setting at which the engine is operated.
    Type: Grant
    Filed: February 13, 1976
    Date of Patent: February 8, 1983
    Inventors: James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher, Dah Y. Cheng
  • Composite membrane for a membrane distillation system
    Patent number: 4316772
    Abstract: A composite membrane separates a distilland and a distillate, such as salt water and fresh water. The composite membrane comprises a thin lyophobic microporous layer or membrane and a thin lyophilic layer or membrane on both sides of the lyophobic membrane or on the distillate side. Evaporation and condensation takes place within the micropores of the lyophobic membrane. The lyophilic layer on the distilland side prevents intrusion of distilland into the pores of the lyophobic layer. The lyophilic layer on the distillate side changes the surface curvature of the liquid/vapor interface in a manner which enhances the distillation rate through the membrane.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: February 23, 1982
    Inventors: Dah Y. Cheng, Steve J. Wiersma
  • Removal of sulfur compounds from combustion product exhaust
    Patent number: 4312643
    Abstract: A method and device are disclosed for removing sulfur containing contaminents from a combustion product exhaust. The removal process is carried out in two stages wherein the combustion product exhaust is dissolved in water, the water being then heated to drive off the sulfur containing contaminents. The sulfur containing gases are then resolublized in a cold water trap to form a concentrated solution which can then be used as a commercial product.
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: January 26, 1982
    Assignee: International Power Technology, Inc.
    Inventor: Dah Y. Cheng
  • Control system for Cheng dual-fluid cycle engine system
    Patent number: 4297841
    Abstract: A control system is disclosed for controlling Cheng dual-fluid cycle engines over a wide operating range to maintain high efficiency under partial load conditions.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: November 3, 1981
    Assignee: International Power Technology, Inc.
    Inventor: Dah Y. Cheng
  • Method and apparatus for distillation
    Patent number: 4265713
    Abstract: A composite membrane structure is used in a distillation apparatus and method. The composite membrane separates a distilland and a distillate, such as salt water and fresh water. The composite membrane comprises a thin lyophobic microporous layer or membrane and a thin lyophilic layer or membrane. Evaporation and condensation takes place within the micropores of the lyophobic membrane. The lyophilic layer prevents intrusion of distilland into the pores of the lyophobic layer.
    Type: Grant
    Filed: February 14, 1979
    Date of Patent: May 5, 1981
    Assignee: International Power Technology, Inc.
    Inventor: Dah Y. Cheng
  • Regenerative parallel compound dual fluid heat engine
    Patent number: 4248039
    Abstract: A regenerative, parallel-compound, dual-fluid heat engine is set forth wherein important engine parameters are specified and linked to each other in a manner which maximizes engine efficiency and throughput for an engine of this type.
    Type: Grant
    Filed: December 6, 1978
    Date of Patent: February 3, 1981
    Assignee: International Power Technology, Inc.
    Inventor: Dah Y. Cheng
  • Regenerative parallel compound dual-fluid heat engine
    Patent number: 4128994
    Abstract: A regenerative, parallel-compound, dual-fluid heat engine is set forth wherein important engine parameters are specified and linked to each other in a manner which maximizes engine efficiency and throughput for an engine of this type.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: December 12, 1978
    Assignee: International Power Technology, Inc.
    Inventor: Dah Y. Cheng