- C.F. Theodor Steinweg receives the United States patent # 204,106 to the “grand piano case construction” (rim bending process). Later he will also patent the rim bending machine. According to C.F. Theodor’s patents, the outer and inner rims are bent separately, and then glued together. It won’t be until 1920s when C.F. Theodor Steinweg’s grand-nephew Theodore Cassebeer invents the method for bending inner and outer rims together, perfecting C.F. Theodor Steinweg’s invention even further.
- On the same day, C.F. Theodor Steinweg receives five more United States patents: # 204,107 to the “double key for upright piano”, #204,108, to “screwed-on tasto bar for upright piano”, #204,109, to “agraffe cast or stamped out with a flat notched head and tapered square stem”, #204,111, to “soundboard sustaining bar arranged cross-wise in relation to the ribs”, and #204,112, to “duplex capo tasto bar for upright piano”.