Patents by Inventor Sisir Kumar Maitra

Sisir Kumar Maitra 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 of cooling recovered sand for casting purposes and apparatus therefor
    Patent number: 4037648
    Abstract: Method and apparatus for the substantially continuous cooling of recovered casting sand in discrete compartments of a bunker whereby the sand in each compartment is cooled while substantially at rest in heat exchange relation with heat exchanger means disposed within the compartment, and the sand thoughput through the compartments is controlled by gates.
    Type: Grant
    Filed: April 3, 1975
    Date of Patent: July 26, 1977
    Assignee: Alfred Gutmann Gesellschaft fur Maschinenbau
    Inventor: Sisir Kumar Maitra