Patent ID: 9326946
Filing Date: 2016-05-03
CPC Classification: A61K

Claim Text:
1. A multilayer tablet comprising a shape having a lower surface, an upper surface, and a peripheral side surface which defines each outer circumference of said lower and upper surfaces, wherein said upper surface comprises a groove-like concave portion having a depth of not less than 0.1 mm, and wherein the layer having said upper surface having the concave portion is the top layer, and the multilayer tablet being produced by a tableting process comprising a tableting step, wherein a die having an inner surface to define said peripheral side surface, a lower punch having a mold surface for pressing to form said lower surface, and an upper punch having a mold surface for pressing to form said upper surface are used in the tableting step, on the mold surface of the upper punch, a convex portion with a height of not less than 0.1 mm for forming a concave portion on the upper surface of the multilayer tablet, all layers in the multilayer tablet are directly pressed by the same upper punch during successive tableting, whereby a concave portion having the same shape as the concave portion of the upper surface is also formed in an upper side surface of each layer other than said top layer, and a material of the layer above each layer protrudes from the under side surface of the layer above into the concave portion of each layer other than said top layer, wherein the multilayer tablet comprises an active pharmaceutical ingredient in each layer, and said groove-like concave portion is a V-shaped groove, and the V-shaped groove has an inside angle of the V-shape of 70 degrees to 100 degrees.