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ABSTRACTS OF RECENT U. S. PATENTS
The views of the readers of the JOURNAL relative to the usefulness to them of the Patent Abstracts regularly published in the JOURNAL will be appreciated. Favorable views are of particular interest . In the absence of a substantial body of opinion to the effect that these Patent Abstracts are desired by the membership, their early discontinuance may be considered. If, after two weeks from the date of mailing the March issue of the JOURNAL, no letters concerning the continuance of the department will have been received, the Patent Abstracts will be discontinued.
1,828,798. Film Treating Apparatus. G. C. BEIDLER. Oct. 27, 1931. The film is delivered edgewise to means for removing the film from the receptacle in which a submerging device is located and other guiding means operate to prevent lateral movement of the film as it is being moved. Means are provided for regulating tension or pressure on the film by coacting rollers which operate to move the film and at the same time exert pressure upon the film to remove fluid, in order to prevent film from carrying an excess amount of fluid from the receptacle in which the film was treated. At the bottom of the coils where they coact, means are provided for moving the film to eject it from a receptacle, an assembly of rollers and conveying bands being provided for continuously directing the film.
1,828,749. Motion Picture Screen. A. L. RAVEN. Oct. 27, 1931. The projection screen comprises a plurality of wavy horizontal strips arranged in overlapping relation with the hollows of the waves of adjacent strips opposite one another and forming sound passages extending upwardly from the rear toward the front of the screen between the strips. The sound from the sound reproducer behind the screen freely passes through the screen at the same time that a proper reflection surface is provided for the screen.
1,828,768. Film Guide. A. DINA. Assigned to International Projector Corp. Oct. 27, 1931. One set of guide members is rigidly mounted for positively locating the film edge with respect to the projection aperture and comprises a plurality of sections spaced longitudinally of the film for permitting dust and accumulations of foreign material to escape therebetween. The other set of guide members comprises a plurality of disks rotatably mounted with their axes transverse to the film and held in firm engagement therewith by means of suitable spring members. The disks are capable of rotating as the film is moved through the projection head thereby eliminating sliding friction and reducing the wear on the film.
1,828,867. Scanning Device. C. FRANCIS JENKINS. Assigned to Jenkins Laboratories. Oct. 27, 1931. The film image is enlarged by projection and directed through a scanning disk thereby permitting (1) the apertures in the scanning disk to be larger, so that diffraction bears a lesser relation to the aperture area; (2) the disk may be positioned in a free air, removed from the proximity of the film, and, therefore, does not clog up with dirt and/or oil; and (3) the apertures may be made square, increasing the light efficiency.
1,828,875. Electrooptical Translation System. C. H. W. NASON. Assigned
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