[1] The O'Sullivans patented their candy-coated popcorn and trademarked the product's name and logo in 1929.
Initially, they licensed the product to existing confectioneries before creating a chain of franchised Karmelkorn stores.
Franchise Growth Corporation in Rock Island, Illinois, acquired Karmelkorn Shoppes Inc. in 1969.
[8] Beginning in 1987, many locations with the three product lines were rebranded as Dairy Queen Treat Centers.
In May of 2019, Dairy Queen International dropped support for its final six locations though retaining the Karmelkorn name and trademark.