And they bought the patent for that from another party, or so goes the story. To be more correct, they obtained patent rights on the bored thru cylinder. Colt was several years ahead on the revolver, and there were probably others before them.
S&W Model 1 the first cartridge revolver in the US?
Lefaucheux Model 1854 the first cartridge revolver...in the world?
Great ol' history!
Yes, the patent was owned by Rollin White which may be one of those inexplicable wonders since I strongly imagine other minds had similar ideas. S&W also very cannily required White to defend his patent against all violators ....a task of great dimensions. The patent office denied White's application for an extension in the early 1870s and the rest is history.
IIRC: The main Rollin White patent was for the "bored through" cylinder, which required the newly attained (from LeFachaux :: spelling) cartridge type ammunition, first available in only ... what would be compared to what we now know as .... .22 short. LeFacheaux first made a rimfire .22 cal. with either BB shot projectile or something very similar to that.
The direct ancestor of the .22 RF metallic cartridge used in the first S&W revolvers was the Flobert, invented in France in the mid-1840s, essentially like a percussion cap with a lead ball as a bullet. It was originally used in gallery or salon (saloon) rifles (salons essentially being gathering rooms). Many of the French nobility (what was left of it) and the upper classes had salon shooting galleries in their homes and in private clubs for amusement.