Patents by Inventor Karl-Ludwig Grell

Karl-Ludwig Grell 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).

  • Novel cylindrical rollers
    Patent number: 4040688
    Abstract: Novel cylindrical rollers for antifriction bearings made of steel with a carbon content of 0.7 to 1.2% by weight, a sorbitic structure and a hardness increased by cold annealing to at least 50 HRC and a novel process for the preparation of said rollers.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: August 9, 1977
    Assignee: Industriewerk Schaeffler OHG
    Inventor: Karl-Ludwig Grell