Finally, in 1939, RCA agreed to pay Farnsworth royalties for his patents. Zworykin had developed a successful camera tube, the iconoscope, but many other necessary parts of a television system were patented by Farnsworth. RCA had not taken Farnsworth’s rejection lightly and began a lengthy series of court cases in which RCA tried to invalidate Farnsworth’s patents. Get a Britannica Premium subscription and gain access to exclusive content.
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