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Zworykin received a patent in 1928 for a color transmission version of his 1923 patent application,[55] he also divided his original application in 1931.[56] Zworykin was unable or unwilling to introduce evidence of a working model of his tube that was based on his 1923 patent application. In September 1939, after losing an appeal in the courts, and determined to go forward with the commercial manufacturing of television equipment, RCA agreed to pay Farnsworth US$1 million over a ten-year period, in addition to license payments, to use his patents.[57][58]