date:Jun 27, 2012
invention is obvious and cannot be patented if it not sufficiently inventive because it is an extension or variations of previous inventions.
Wrigleys patent was deemed to be anticipated due to an earlier patent from Procter Gamble that detailed oral composition, including chewing gum, containing xylitol and bis-glycinate. W-23 and menthol was among the cooling agents mentioned in this patent.
Wrigleys patent was also consideredobviousbased upon an earlier patent from Warner-Lambert and a stu