| Patents for G03B 21 - Projectors or projection-type viewers; Accessories therefor (41,465) |
|---|
| 04/10/1991 | EP0421628A2 Projection type liquid crystal display device |
| 04/10/1991 | EP0420984A1 Information videoinstallation |
| 04/10/1991 | CN2074920U Telescopic sight card |
| 04/09/1991 | US5005968 Contrast decreasing apparatus in image forming optical system |
| 04/09/1991 | US5005967 Microfilm image processing apparatus having automatic focus control capabilities |
| 04/09/1991 | US5005950 Giant liquid crystal display means |
| 04/09/1991 | US5005945 Rear projection screen and rear projection system comprising such a screen |
| 04/09/1991 | CA1282766C Light-tight film reel |
| 04/03/1991 | CN2074469U Interlocking controller for 360-deg. circular screen film projectors |
| 04/03/1991 | CN1012289B Positive image superminiature multifunctional projector |
| 04/02/1991 | US5004335 System for reproducing three-dimensional, that is four-dimensional, images and, particularly moving images by projection, without the use of coherent light |
| 04/02/1991 | US5004331 Catadioptric projector, catadioptric projection system and process |
| 03/27/1991 | EP0418947A1 Projection system |
| 03/26/1991 | US5003343 Projection copying apparatus and projection screen therefor |
| 03/21/1991 | WO1991003764A1 Transparent calculator for overhead projection |
| 03/20/1991 | CN2073592U Episcopic screen magnascope |
| 03/13/1991 | EP0417039A1 Illumination device for projection means |
| 03/13/1991 | CN2073122U 卧式投影器 Horizontal projector |
| 03/13/1991 | CN2072954U Forwarder of holed type |
| 03/07/1991 | WO1991003003A1 An active matrix reflective projection system |
| 03/07/1991 | WO1991002998A1 Reflective image plane module |
| 03/05/1991 | US4998283 Screen device |
| 03/05/1991 | US4998191 Illuminating optical device |
| 03/05/1991 | US4998138 Microfilm reader-printer |
| 03/05/1991 | US4997271 Method of and an apparatus for producing a required visual signal for direct observation from a first source of light in the presence of a second source of light |
| 03/01/1991 | CA2023562A1 Transparent calculator for overhead projection |
| 02/27/1991 | EP0414313A1 Rear projection screen and rear projection system comprising such a screen |
| 02/27/1991 | CN2072236U High-performance timer for projecting film |
| 02/26/1991 | US4995719 Method of and an apparatus for projecting a scanned two- or three-dimensional modulated light pattern originating from a light source |
| 02/26/1991 | US4995221 Film jacket for flat articles, particularly slide frames |
| 02/26/1991 | CA1280631C Overhead projector |
| 02/21/1991 | WO1991002372A1 Wafer based active matrix |
| 02/20/1991 | CN2071795U Improved structure of background projector |
| 02/19/1991 | US4993806 Rear-projection screen |
| 02/14/1991 | DE3926541A1 Microfilm cassette with rotatable spool - is mounted on coaxial ball-bearing which fits in spool |
| 02/14/1991 | DE3926325A1 Film feed mechanism for intermittent, direct drive of feed roller - implements stored transport profile with fully uniform acceleration using closed motor control loop |
| 02/13/1991 | CN1049230A Total reflection reflector of single machine shooting and showing ring film |
| 02/12/1991 | US4991955 Circular projection and display system using segmented trapezoidal screens |
| 02/12/1991 | US4991933 For use in a liquid crystal display |
| 02/07/1991 | DE3939555C1 Overhead optical projector with condenser contg. socket - has resetting device moved by column deflection to retract objective lens into projector head |
| 02/07/1991 | DE3924861A1 Reducing noise from cine cameras - involves applying fibre coating to inside surfaces |
| 02/06/1991 | EP0411075A1 Photographic accessory device to distribute slides onto a transparent screen without need to manipulate individual slides. |
| 02/06/1991 | CN2070919U Directional high reflecting rate screen |
| 02/05/1991 | US4990951 Image forming apparatus having function for controlling shutter by a pulse |
| 02/05/1991 | US4989330 Overhead type file sheet projectors, and file sheets and jacket holders for use in such projectors |
| 02/05/1991 | CA1279858C Endless loop transport and storage system |
| 02/05/1991 | CA1279781C Projection screen |
| 01/31/1991 | DE3925087A1 Daylight projector with automatic sheet changeover - has arm with suction cup transferring sheets from loose stack |
| 01/30/1991 | EP0410859A2 Holding device for a film carrying a picture to be projected |
| 01/29/1991 | US4988556 Pocket mount |
| 01/29/1991 | US4988187 Image projector apparatus having automatic focus control system |
| 01/29/1991 | US4988176 Projection lens |
| 01/23/1991 | EP0409619A2 A projection type image display apparatus |
| 01/22/1991 | US4986651 Overhead projector with centerless Fresnel lens reflective stage |
| 01/17/1991 | DE3923140A1 Overhead projector with LCD plates - has fresnel lens plate in hinged frame enabling projection of LCD images and computer generated text |
| 01/15/1991 | US4985815 Light reflector |
| 01/15/1991 | US4984871 Optical rear projection screen hanger assembly |
| 01/10/1991 | WO1991000673A1 A technique for scanning a microfilm image moving at a variable speed |
| 01/10/1991 | WO1991000546A1 Overhead projector |
| 01/10/1991 | WO1991000538A1 Correction method for distortion of image in inclined projection |
| 01/09/1991 | EP0406576A2 Method for memorising data of drawings by use of a CAD laser plotter for film cards and microfilm card/film card laser plotter to carry out this method |
| 01/09/1991 | EP0406260A1 Film-strip feed mechanism |
| 01/09/1991 | CN2069125U Electronic moistener for films |
| 01/08/1991 | US4983032 Radiation beam |
| 01/08/1991 | US4983016 Bar shaped members of one resin dispersed in another, television |
| 01/08/1991 | CA1278712C Projecting apparatus with spherical screen, more particularly for advertising purpose |
| 01/05/1991 | CA2020318A1 Process for the storing of drawing data by means of a cad film-card laser plotter, a microfilm card and a cad film-card laser for its implementation |
| 01/02/1991 | EP0404791A1 Device for controlling and adjusting film-strip feed in a film projector. |
| 01/02/1991 | CN1011089B Projection screen having high resolution and good mechanical stability |
| 01/01/1991 | US4981409 Cartridge auto changer |
| 01/01/1991 | US4981352 Projection display device |
| 01/01/1991 | US4981351 Film retrieving apparatus |
| 12/26/1990 | CN1048106A Optical illumination system and projection apparatus comprising such a system |
| 12/25/1990 | US4979813 Including a light source |
| 12/25/1990 | US4979801 Rear projection screen having a wide-ranged extinguishing rate for use in a TV receiver |
| 12/25/1990 | US4979800 Rear-projection screen |
| 12/22/1990 | WO1990016009A1 Improved screen for the reproduction of static or movable tridimensional images, and method for fabricating such screen |
| 12/19/1990 | CN2067841U Cinefilm random moistener |
| 12/19/1990 | CN2067840U Multifunctional combined projector for chemical experiments |
| 12/19/1990 | CN1047951A Modulation system for projection display |
| 12/18/1990 | US4978218 Folding arm for overhead projector |
| 12/18/1990 | US4978216 Figure with back projected image using fiber optics |
| 12/18/1990 | US4978215 Image projecting system |
| 12/18/1990 | CA1278080C Projection-type multi-color liquid crystal display device |
| 12/13/1990 | WO1990015361A1 Control code for cinematic films |
| 12/12/1990 | EP0402137A2 Projection type image display apparatus |
| 12/12/1990 | EP0401912A2 Modulation system for projection display |
| 12/12/1990 | CN1010807B Liquid crystal display projection system having improved contrast |
| 12/11/1990 | US4977326 Luminescent screen |
| 12/11/1990 | US4976536 Liquid crystal display for projection systems |
| 12/05/1990 | CN1047575A 4:3 perf conversion sprocket |
| 12/04/1990 | US4974958 Projecting optical apparatus having no trapezoidal distortion |
| 12/04/1990 | US4974788 Film spool with separate keeper |
| 12/04/1990 | US4974779 Screen forming apparatus and method |
| 12/02/1990 | CA2018138A1 Overhead projection highlighting device and method of use |
| 11/29/1990 | WO1990014554A1 Information display stand-board |
| 11/28/1990 | EP0398939A1 Light socket soft start and power interrupt assembly |
| 11/27/1990 | WO1990014533A1 4:3 perf conversion sprocket |
| 11/27/1990 | US4973884 Substitute lamp module for projectors |
| 11/21/1990 | CN2066157U Background projection machin for photograph in room |