Method of manufacturing porous anodized alumina film
Patent 6139713 Issued on October 31, 2000. Estimated Expiration Date: 
November 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAnodic aluminium oxide membranes Patent #: 4889631 InventorsAssigneeApplicationNo. 180240 filed on 11/02/1998US Classes:205/206, Contacting substrate with solid member or material (e.g., polishing, rolling, etc.)205/213, Predominantly aluminum substrate205/223, Etching of coating205/229, Predominantly nonmetal electrolytic coating205/324, Anodizing205/328, Utilizing sulfuric acid-containing bath205/332Utilizing organic compound-containing bathExaminersPrimary: Valentine, Donald R.Assistant: Leader, William T. Attorney, Agent or FirmForeign Patent References
International ClassC25D 011/16Foreign Application Priority Data1996-08-26 JPAbstractA plurality of recesses having the same interval and array as those of pores of an alumina film, which are to be formed in anodizing, are formed on a smooth surface of an aluminum plate in advance, and then, the aluminum plate is anodized. With this process, the roundness of the pores of the porous anodized alumina film and the uniformity of pore size are improved, and the pores are regularly arrayed at a predetermined interval. The recesses are formed by pressing a substrate having a plurality of projections on its surface against the aluminum plate surface to be anodized.Other References
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