Patents by Inventor A. Nimal Liyanage

A. Nimal Liyanage 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).

  • Method and system for assessing the operating condition of a pressure regulator in a corrosive gas distribution system
    Patent number: 5677480
    Abstract: A method of detecting a malfunction or failure of a pressure regulator in a corrosive or reactive gas distribution system while in use involves continuously measuring or monitoring the output pressure of the pressure regulator, both in the presence and the absence of gas flow. The onset of a malfunction of the pressure regulator can be predicted when the differential output pressure between flowing and non-flowing gas fluctuates highly and increases gradually. Failure of the pressure regulator or of the total system is detected when the differential output pressure in the presence and absence of flowing gas exceeds some experimentally determined value.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: October 14, 1997
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: A. Nimal Liyanage, Eiichi Ozawa, Kazuo Yokogi, Jean-Marie Friedt
  • Corrosion resistant welding of stainless steel
    Patent number: 5299731
    Abstract: A process for welding stainless steel tubing in the presence of an inert gas comprising a silicon base gas, in particular silane SiH.sub.4. During the welding operation, a suitable quantity of silicon is deposited by chemical vapor deposition at the weld joint to significantly improve the corrosion resistance of the weld.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: April 5, 1994
    Assignee: L'Air Liquide
    Inventors: A. Nimal Liyanage, Henri Chevrel, Alain Boireau, Jean-Marie Friedt