Patents Assigned to Riken Lightmetal Industry Co., Ltd.
  • Process for producing a protective film on an aluminum surface
    Patent number: 3988217
    Abstract: A process is disclosed for producing a firmly adhered, corrosion resistant film on an aluminum or aluminum alloy surface by means of anodization using an electrolyte containing at least one of the compounds selected from the group consisting of quaternary ammonium salts, aliphatic primary amines and aliphatic secondary amines which compounds act upon a coating to cause the same to adhere intimately to the aluminum surface on one hand and impart corrosion resistance to the latter on the other.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: October 26, 1976
    Assignee: Riken Lightmetal Industry Co., Ltd.
    Inventor: Masashi Ikegaya