https://patentbrief.org/company/rainbow-crafts-inc Plain-English explanations of patents assigned to Rainbow Crafts Inc, newest first. en-us Sat, 13 Jun 2026 10:09:16 GMT https://patentbrief.org/patent/us/3167440/play-doh-modeling-compound The original 1965 patent for the soft, non-toxic modeling compound known as Play-Doh, detailing a specific mixture of flour, water, salt, and kerosene. Tue, 26 Jan 1965 00:00:00 GMT https://patentbrief.org/patent/us/3167440/play-doh-modeling-compound