Although the design patent may be public domain, the character copyright for Betty Boop doesn't expire until 2026. See COM:CHAR and Commons:Character copyrights. The only aspects of this image that would be truly public domain would be those that are original to the design patent, which are likely to be little to none.
{{subst:delete2|image=File:Betty Boop patent fig1.jpg|reason=Although the design patent may be public domain, the character copyright for Betty Boop doesn't expire until 2026. See COM:CHAR and Commons:Character copyrights. The only aspects of this image that would be truly public domain would be those that are original to the design patent, which are likely to be little to none.}} ~~~~
English: Betty Boop character design, figure 1 from U.S. patent application D86224 "Design for a Doll or Similar Article". The original drawing was published on 9/24/1931, but my colored and modified version of the drawing was done on 2/4/2015.
I colored the original black and white drawing, and I also altered the drawing a little bit. I lengthened the dress. I made the eyes more symmetrical. I shortened the lengthy eyelashes to model them after a more recent drawing of Betty Boop. I added green irises to the eyes which I modeled after a more recent drawing of Betty Boop. I fixed the unrealistic thicknesses of the knee joints. Lastly, I changed the thigh accessory to make it a heart design.