Patents by Inventor Lars Lidstrom

Lars Lidstrom 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 grinding cement
    Patent number: 5651505
    Abstract: A method of continued grinding of cement is disclosed in order to obtain cement with a high specific surface and/or a steep grain size distribution curve. The grinding is performed in a mill with agitated grinding medium from a specific surface of 300-400 m.sup.2 /kg (Blaine) to a specific surface of up to 1,200 m.sup.2 /kg (Blaine) and with a particle size distribution such that about 80% of the particles pass a sieve opening with a size up to about 25 microns, using grinding bodies with an average size within the interval of 2 to 15 mm.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: July 29, 1997
    Assignee: Cementa AB
    Inventor: Lars Lidstrom
  • Treatment of middlings
    Patent number: 4860957
    Abstract: Regrinding of middlings in a mineral-product dressing process of the kind in which the middlings are reground in order to crush individual half-grains and release valuable mineral therefrom, is carried out in a mill using an agitated grinding medium. The middlings are reduced to a particle size which is smaller than k.sub.80 =100 mm. There are used grinding bodies having originally a size of from 2 to 12 mm.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: August 29, 1989
    Inventor: Lars Lidstrom