Unicharm's Canadian patent for sanitary napkin expires

OTTAWA , July 14, 2014 () – Unicharm Corp's patent for sanitary napkin has expired. This invention was developed by Wada Mitsuhiro, Kondo Hideki and Shimizu Shingo.

The patent application number is CA19942127747 19940711. The patent publication number is CA2127747 (C). International Patent Classification codes are A61F13/15, A61F13/514, A61F13/539 and (IPC1-7): A61F13/56. Cooperative Patent Classification codes are A61F13/4753, A61F13/49413, A61F2013/4948 and A61F2013/51316.

According to the abstract released by the Canadian Intellectual Property Office: "In a sanitary napkin, a supplementary flap comprising an elastic band-like sheet is in its stretched state attached to a top surface of a side flap disposed at a side edge of an absorbent core."

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