Editing Yo-yo (section)

=== 1960s resurgence ===
Declining sales after [[World War II]] prompted Duncan to launch a comeback campaign for his trademarked "Yo-Yo" in 1962 with a series of television [[advertising|advertisements]].{{citation needed|date=October 2024}}

In a trademark case in 1965, a federal court of appeal ruled in favor of the Royal Tops Company, determining that ''yo-yo'' had become a part of common speech and that Duncan no longer had exclusive rights to the term.<ref name="names">{{cite web |url= https://www.genericides.org/trademark/yo-yo|title= Has yo-yo become a generic trademark?  |access-date= March 2, 2021 |website= genericides.org |date= March 31, 2020 }}</ref> As a result of the expenses incurred by this legal battle as well as other financial pressures, the Duncan family sold the company name and associated trademarks in 1968 to Flambeau, Inc, which had manufactured Duncan's plastic models since 1955.{{citation needed|date=November 2014}} {{as of|2020}}, Flambeau Plastics continued to run the company.<ref>[https://www.flambeau.com/wp-content/uploads/2020/11/Flambeau-Corporate-Brochure-English-Sept2020.pdf Flambeau Corporate Brochure], flambeau.com</ref>
[[File:Metallyoyos.jpg|thumb|left|Modern yo-yos, some made of both aluminium and stainless steel]]