![Item #528202511 De Forest Patent Holding Company 1923 Certificate for Twenty Two [22] Shares of Capital Stock. DeForest Patent Holding Company.](https://32-1rarebooks.cdn.bibliopolis.com/pictures/528202511.jpeg?width=768&height=1000&fit=bounds&auto=webp&v=1748544888)
De Forest Patent Holding Company 1923 Certificate for Twenty Two [22] Shares of Capital Stock
Wilmington: DeForest Patent Holding Company, 1923. Softcover. 10 3/4" x 8." Dated March 26, 1923. Signed by the company president and the company secretary. In November of 1922, Lee De Forest organized the De Forest Patent Holding Company to assign all of his sound recording and reproducing patents, as well as his numerous other patent applications. In total, more than 70 patents were involved. The company was also charged with the commercial development of De Forest's Photofilm machine. The machine, instead of recording sound and picture on the same negative, recorded them separately. The two could then be printed together on the positive used for actual projection. In this way the sound track could be set slightly ahead of the visual portion of the film to compensate for the time lag. Very Good condition with two light vertical folds and a very short closed tear at one on the folds. Item #528202511
Price: $30.00