James Paris Lee (of Lee-Enfield, Remington-Lee, and Winchester-Lee Navy fame) received US Patent 193524 on July 24, 1877 while he was living in Ilion, NY, working with Remington.
This patent addressed the issue of primer safety in tubular magazine firearms (Such as the Remington-Keene and most Winchesters).
Lee invented a primer with the back of the primer cup (the portion closing the base of the cartridge case) concave instead of flat or slightly convex, and possible placement of some inert material on the inside of the cup to cushion any blow less than that from a firing pin indentation. Copy of the patent drawing below.
Was this ever put into production, most likely by Remington or U.M.C., but perhaps another maker?