Patents by Inventor Helmut Grey

Helmut Grey 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 repairing a hot-blast long-time cupola furnace
    Patent number: 5217658
    Abstract: A method for repairing a hot-blast, long-time cupola furnace by removing residual slag and relining the cupola furnace including feeding liquid nitrogen to the cupola furnace immediately at the end of a smelting operation and simultaneously with the feeding of the liquid nitrogen, removing residual slag from the furnace. The furnace is cooled with liquid nitrogen until the furnace reaches a temperature of less than or equal to 40.degree. C. after which the furnace is relined with fresh refractory tamping compound.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: June 8, 1993
    Assignee: Georg Fischer AG
    Inventors: Hans Schmidt, Max Lehner, Helmut Grey