[Validark]

According to Wikipedia, Alexander Parkes created the first celluloid (later called "Parkesine") on purpose in 1855 (as mentioned in the article, Collodion already existed and, when dried, created a celluloid-like film). John Wesley Hyatt apparently acquired Parkes's patent.

Daniel Spill, who worked with Parkes directly in England, founded several companies with Parkes selling Celluloid in England.

Spill and Hyatt spent the better part of a decade in court against each other over who invented it first and who has the right to the patents. The judge ultimately ruled that both of them can continue their businesses, and that Parkes invented it first.