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Wouldn't the first such patent (2+-signal stereo) be that of Clement  Ader 
(1881-1882)?
 
US  Pat 257,453   Telephonic  Transmission of Sound from Theaters      
 
His Earlier Fr Pat = Aug 9, 1881.
 
Allen
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In a message dated 2/12/2017 1:51:17 P.M. Eastern Standard Time,  
[log in to unmask] writes:

> The  earliest patented solution of stereo sound on film was by W. 
> Bartlett  Jones of Chicago, whose USP 1,944,182 was filed 18 November 
> 1930 and  patented 23 Jan 1934

> He was the pioneer in stereophony, years  ahead of Blumlein, Maxfield, 
Harrison, and Keller.

> Jones' first  work in stereophony was put officially to paper in 1927 and 
published in  several other patents. It is difficult to see that Western 
Electric could have  avoided taking licenses if they wanted to commercialise 
Maxfield's or Keller's  contributions. We have not heard about that.

> Keller and Rafuse  USP2, 114,471 filed their application on the 
individual recording of each  groove flank on 20 June 1936.