Miller from Klaus Neuschafers history of Laflin and Rand " Laflin and Rand developed there smokeless shotgun powder in 1898 and named it Infallible. In 1907 DuPont bought out Laflin and Rand and continued making Infallible until 1912 when the US Government caused DuPont to break up it's monopoly on the Powder companies and transferred rights to Infallible to Hercules Powder Company which continued to produce Infallible in canister grade until 1937 and beyond for ammunition manufacturers. At some point Hercules was also producing Infallible and marketing it as Unique.
If you are interested here is a link to the Laflin and Rand history:
http://www.castpics.net/subsite2/GeneralReference/L&R-Smokeless.pdf
