International photographer (Jan-Dec 1941)

P fl T € n T By ROBERT W. FULWIDER Patent Attorney, Los Angeles No. 2,238,497 — Sound Camera. William E. Merriman, assignor to Eastman Kodak Company. Appln. Oct. 14, 1939. 15 claims. A sound camera in which the sound drum shaft is first connected to the drive means to bring it up to speed, and then disconnecting the shaft and drive means, and connecting the drive and film feeding means. No. 2,238,547 Photographic Developer. William H. Wood, assignor to Harris-Seybold-Potter Company. Appln. June 6, 1939. 3 claims. A process of developing photographic images and hardening the gelatinous surfaces with a silver halide developer in the presence of a potassium sale embodying potassium pyrophosphate. No. 2,238,629 - Method for Stereoscopic Scanning of Pictures. Jacob u. Deninson, New York. Appln. April 24, 1937. 2 claims. A method of producing stereoscopic projection of motion pictures by the use of a single film, the film having side-by-side pictures which are alternately projected. No. 2,238,733-35 — Recording and Reproducing Sound. Erik Waldemar Hullegard, Stockholm, Sweden, assignor to Radio Corporation of America. Appln. Mar. 17, 1938. In Sweden March 23, 1937. 4 claims. A sound record of the photophonographic type including a film having images of opposite half cycles of sound waves thereon in different colors, and an opaque background surrounding said wave images. No. 2,238,947 — Sound Recording System. Oscar A. Ross, New York, N. Y. Appln. July 15, 1937. 8 claims. A method of sound recording in which a record is made of the frequency and amplitude of the sound waves while a second record is made of their amplitude only, and re-recording the sound while varying its amplitude by means of the second record. No. 2,238,996 — Sound Track. Cleaner for Motion Picture Film. Roy J. Fisher, assignor to Harold J. Nagle, Roy fislicr and Nelson II. Copp, all of Mochester, N. Y., as joint trustees. Appln. Dec. I. L936. 7 claims. A device for (leaning a film while the latter is in motion, and comprising a pair ol rotatably mounted cleaning members bearing against the film. \o. 2,239,380 — Slating Device. Daniel Hi miii Clark and Grover Laube, assignors to Twentieth Century box Film Corporation. Appln. Jan. 16, 1940. 8 claims. A slating device for motion picture cameras and having a housing adapted to be inserted between the camera and its magazine, with a compartment in the housing to receive indicia, and means to project a moving image of the indicia on the moving film. No. 2,239,532 - Film Tempo Punch. Royal C. McClay, assignor to Warner Brothers Pictures, Inc. Appln. Oct. 24, 1938. 15 claims. A device for intermittently feeding film from one reel to another and punching the film while it is at rest. No. 2,239,698 — Photographic Element. Burt H. Carroll, assignor to Eastman Kodak Co. Appln. Feb. 20, 1940. In Great Britain March 9, 1939. 7 claims. A film having a base, an emulsion sensitized to green light with a sensitizing dye, and a blue sensitive emulsion containing a dye which adsorbs to the silver halide in the layer and imparts substantially no extension to the spectral sensitivity of the layer. No. 2,239,699 — Prevention of Diffusion of Sensitizing Dyes. Burt H. Carroll, assignor to Eastman Kodak Company. Appln. Feb. 20, 1940. In Great Britain March 9, 1939. 10 claims. A photographic silver halide emulsion sensitized with a quaternary ammonium salt sensitizer and containing a perhalogenate salt other than a quarternary ammonium perhalogenate. No. 2,240,131 — Arrangement for Securing Stereoscopic Conematographic Projections. Suzzane Carre, nee Berment, France, assignor to Societe a Responsabilite limitee dite: La Cronostereoscopic. Paris, France. Appln. March 18, 1938. In France March 23, 1937. 1 claim. A device for obtaining stereoscopic pictures by alternately projecting right and left images through a screen and simultaneously moving a grid back and forth between the screen and the spectators. No. 2,240,398 — Cinematography. Lionel Hubert Huitt, Rangoon, Burma, British India. Appln. April 21, 1939. In Great Britain June 28, 1939. 16 claims. A movable screen in a motion picture camera, the screen permitting a small sharp image to be formed, with increasing diffusion away from the sharp image, and movable by the operator of (he camera. No. 2,240,703 — Projector for Stereoscopic Pictures — Fritz Kober. assignor to Zeiss Ikon Aktiengesellschaft, Germany. Application February 16, 1939. In Germany, Feb. 22, 1938. 4 claims. A projector for stereoscopic pictures having a polarizing filter over each half of objective lens, and a pair of prisms to deflect the differently polarized images so they are superposed on the screen. No. 2,240,844 — Picture Projection. Jeremiah F. Goggin. Moline, 111., and Ray E. Hall, Davenport, Iowa. Application May 21, 1938. 3 claims. A method of projecting pictures which uses phosphorescent screen which glows with the image of the preceding picture while the next one is being moved into projecting position. No. 2,240,728— Stereo Camera. Otto Vierling, Dresden -Blasewitz, and Fritz Kober, Dresden, Germany, assignors to Zeiss Ikon Aktiengesellschaft, Dresden, Germany. Application Nov. 17, 1938, Serial No. 241,065. In Germany Nov. 19, 1937. 3 claims. A stereoscopic projector using polarizing filters and having prisms which superpose the images on the screen without the formation of secondary images. No. 2,241,104 — Process and Apparatus for the Treatment of Photographic Coatings. Lodewijk Pieter Frans van der Grinten, Venlo, Netherlands, assignor to Naamlooze Vennootschap Chemische Fabriek L. van der Grinten, Venlo, Netherlands. Application April 22, 1939. in the Netherlands, Jan. 19, 1939. 25 claims. A method of developing or fixing films by the "semi-wet" process in which the film is subjected to a number of closely spaced fine sprays of treating liquid. No. 2,241,124 — Printing Method for Color Photography. Otto C. Gilmore, assignor to Cosmocolor Corporation, Jersey City, N. J. Original application May 25, 1939. Divided and this application Dec. 7, 1939. 5 claims. A method of optically printing a film having two smaller, complete images of different color values in a single frame, the method including printing one set of images on one side of duplitized film and then reversing the images of the other set and printing on the other side of the film. No. 2,241,239 — Ultraviolet Light Filter. Burt H. Carroll and Cyril J. Staud, assignors to Eastman Kodak Company, Rochester, N. Y. Application Jan. 19, 1940. In Great Britain, Jan. 23, 1939. 10 claims. A film affected by ultraviolet light which has a colloidal material which acts as a filter on the film. No. 2,241,413 — Photographic Printing Process and Image for Use Therein. A method of printing color photographs in which there are at least two color value images, one of the images being a composite double-colored image. No. 2,241,519 — Photographic Material. Louis Pollak, Altrincham. Cheshire, Eng 24