Manufacture of aluminum articles with anodized surfaces presenting multicolor effects

• US 3,284,321 A
• Filed: 07/19/1962
• Issued: 11/08/1966
• Est. Priority Date: 07/19/1962
• Status: Expired due to Term

• Current Assignee: Howard A. Fromson
• Original Assignee: Howard A. Fromson
• Inventors: Fromson, Howard A.
• Application Number:
  US04/210,908
• Time in Patent Office: 1,573 Days
• US Class Current: 205/50
• CPC Class Codes: C25D 11/022 Anodisation on selected surface areas
• CPC Class Codes: C25D 11/04 of aluminium or alloys based thereon
• CPC Class Codes: C25D 11/08 containing inorganic acids
• CPC Class Codes: C25D 11/10 containing organic acids
• CPC Class Codes: C25D 11/12 Anodising more than once, e.g. in different baths

Claims

1. IN A PROCESS OF PRODUCING A MULTI-COLOR EFFECT ON THE SURFACE OF AN ALUMINUM ARTICLE, THE COMBINATION OF STEPS COMPRISING APPLYING A RESISTANT MASK TO A PREDETERMINED UNDYED AREA OF SAID SURFACE WHILE LEAVING ANOTHER UNDYED AREA EXPOSED, ANODIZING THE EXPOSED AREA BY TREATMENT IN AN ANODIZING ELECTROLYTIC BATH, STRIPPING THE MASK FROM THE ARTICLE, AND ANODIZING THE STRIPPED AREA OF THE SURFACE BY TREATMENT IN AN ANODIZING ELECTROLYTIC BATH, WHILE THE PREVIOUSLY ANODIZED UNDYES AREA IS ALSO EXPOSED TO THE LATTER BATH THE TWO ANODZING STEPS BEING CARRIED OUT UNDER CONDITIONS TO PRODUCE DIFFERENT COLORATIONS IN THE TWO ANODIZED AREAS RESULTING SOLELY FROM ANODIZATION OF BOTH OF SAID AREAS BY THE END OF THE SECOND ANODIZATION PERIOD.