I just thought of somethin

I just thought of something.

It would be interesting to research whether a similar situation existed while the typewriter was under patent.

Or, even the ball point pen. A long time ago, but might show evidence of an unprecedented concept.

Back then, when you bought a typewriter, did the patent owner have any rights over the letters typed by writers that used the typewriter, or was the first sale of the typewriter itself the only thing they could charge for?