Procter & Gamble Hit With Patent Suit Over Crest 3D Whitestrips

Procter & Gamble Co. was hit with an infringement lawsuit in federal court in California by Cao Group Inc., which says the consumer supplies giant’s Crest 3D Whitestrip products violate its peroxide gel patents.

Cao, which launched its Sheer White! Teeth Whitening Strips for dental patient in-home use in 2010, says P&G’s Crest 3D Whitestrip products violate patents No. 10,603,259 and No. 10,649,419, which both describe “peroxide gel compositions.”

Cao says that Steven D. Jensen, a Caochemist, is an inventor of both patents.

Cao says P&G has known about Cao’s whitening products and its related intellectual property since at least ...