Patents by Inventor Amalendu J. Majumdar

Amalendu J. Majumdar 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).

  • Cement compositions
    Patent number: 5073197
    Abstract: The advantages of high alumina cement (early strength, resistance to sulphate attack) are preserved and its disadvantage (weakens with age) is solved by mixing it 50:50 with silica fume, gasifier slag, fly ash or other pozzolanic or latently hydraulic material. This encourages formation of gehlenite octahydrate in preference to the harmful `conversion` (weakening) reaction.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: December 17, 1991
    Assignee: National Research Development Corporation
    Inventors: Amalendu J. Majumdar, Bahadur Singh
  • Cement composition
    Patent number: 4961787
    Abstract: The advantae of high alumina cement (early strength, resistance to sulphate attack) are preserved and its disadvantage (weakens with age) is solved by mixing it 50:50 with ground granulated blast furnace slag. This encourages formation of gehlenite octahydrate in preference to or to the exclusion of the harmful `conversion` (weakening) reaction.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: October 9, 1990
    Assignee: National Reserach Development Corporation
    Inventors: Amalendu J. Majumdar, Bahadur Singh