Ramprat wroteThe first is Feb. 1, 1870 and the second is May 23, 1871
The first patent is US 99,400 which is for the indirect drive feature (in the patent it is portrayed as being inside the layers of the door while in modern usage it is part of the lock body):

The second patent is probably US 115,230 for a zero-change lock which would eliminate a second mark on the dial ring.
It could also be 115,231 which was for a manipulation-resistant lock which I think was the original Peerless lock using a two-piece “pincer” bolt:

[unknown]