Patents by Inventor Nadezhda N. Mankina

Nadezhda N. Mankina 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 for cleaning internal heat transfer surfaces of boiler tubes
    Patent number: 4581074
    Abstract: A method for cleaning and removing iron oxide deposits from the internal heat transfer surfaces of boiler tubes, which consists in purging the tubes with superheated steam and oxygen driven at a speed of 20 to 80 m/sec. The oxygen content is 0.3 to 1.0 kg per ton of steam. The process both cleans and passivates the metal surfaces of the tubes.
    Type: Grant
    Filed: February 3, 1983
    Date of Patent: April 8, 1986
    Inventors: Nadezhda N. Mankina, Valentina Y. Kaplina, Ivan A. Govorukhin, Nikolai I. Gruzdev, Jury E. Mishenin, Nester I. Serebryannikov, Boris S. Fedoseev