A letter from a patent attorney dated 24 March 1894 shows that Platt sought advice on trademark protection for the use of 'Sunday' for ice-cream novelties a few days earlier."

The ice cream sundae soon became the weekend semi-official soda fountain confection at the beginning of the 1900s and quickly gained popularity.

This generated controversy on social networks in the British-Irish territories due to the name's connotation with the Bloody Sunday massacre in 1972.

[5] Various localities have claimed to be the birthplace of the ice cream sundae, including Plainfield, Illinois; New Orleans, Louisiana; Cleveland, Ohio; and New York City.

When Berners died in 1939, the Chicago Tribune headlined his obituary "Man Who Made First Ice Cream Sundae Is Dead".

When Ithaca, New York's mayor Carolyn K. Peterson proclaimed a day to celebrate her city as the birthplace of the sundae, she received postcards from Two Rivers' citizens reiterating that town's claim.

"Some ingenious confectioners and drug store operators [in Evanston]... obeying the law, served ice cream with the syrup of your choice without the soda [on Sundays].

The oldest-known written evidence of a sundae is Platt & Colt's newspaper ad for a "Cherry Sunday" placed in the Ithaca Daily Journal on April 5, 1892.

Sonntag established his own pharmacy (as early as 1893 and no later than 1895) in a building constructed in the months following a December 1891 fire that devastated one side of the town's business district.

Over the years a less elaborate version with vanilla ice cream, chocolate sauce and Spanish peanuts, has become more common.

Several ice cream manufacturers (Blue Bell, Bryers, Turkey Hill) have created tin roof sundae flavors, based on the original recipe.