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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 5214459 | Overhead projectors The objective of the invention is an overhead projector (1) supplied with acetate film rolls (4), to which projector belongs a body (2) onto which is fixed a projection arm (16) equipped with a lens/lenses (21) and a flat mirror (20). The body (2) is supp... | 05/25/1993 |
| 5206673 | Reflection type overhead projector A mirror Fresnel lens (12) is disposed on a base (11), on which a liquid crystal display (18) is mounted. The liquid crystal display (18) is provided with a polarization plate (24) only in the mirror Fresnel lens (12) side. Light from a light source (15) ... | 04/27/1993 |
| 5200843 | Polarized synthesization in projection type liquid crystal displays A projection type liquid crystal display (LCD) system having a light source, a light separation device for separating light from the light source into color components, a liquid crystal light valve for modulating light from the light separation device, a ... | 04/06/1993 |
| 5194884 | Image projection system employing a cold cathode field-emission image source An image projection system utilizing a cold cathode field emission device to provide the image source is provided. By using a cold cathode field emission device as an image source, an improved image may be achieved as compared to that of a conventional el... | 03/16/1993 |
| 5192962 | Converging reflector and liquid crystal display device A converging reflector comprises a linear light source having two end points located with a predetermined spacing therebetween, a first reflection surface having a curvature so as to have a focal point at one of the two end points, and a second reflection... | 03/09/1993 |
| 5146248 | Light valve projection system with improved illumination A light valve projection system includes an illumination system having a light collector in the form of a non-imaging reflector with a rectangular input aperture and a rectangular output aperture. A two dimensional light source at the input aperture illum... | 09/08/1992 |
| 5108172 | Active matrix reflective image plane module and projection system An improved active matrix reflective projection system utilizing a conventional wafer includes a reflective image plane module forming two focal images. The image plane module includes light directing and reflecting structures and a wafer based active mat... | 04/28/1992 |
| 5085505 | Overhead projector An overhead projector comprises two light sources, a first reflection mirror that reflects a light from an illuminating light source of said light sources toward a reflection type light collection lens and a projection lens that projects a light reflected... | 02/04/1992 |
| 5052797 | Copy viewer A copy viewer having a support stand for holding material to be copied in a viewing position and a "see-through" display device for displaying copied material directly over the material to be copied.... | 10/01/1991 |
| 5004336 | Transmissive original projecting apparatus A transmissive original projecting apparatus has an illuminator for illuminating a transmissive original, a projector for directing light transmitted through the transmissive original to the original supportion portion of an original reading apparatus, an... | 04/02/1991 |
| 4971436 | Projector In projection device light from a point light source unit is reflected by a first reflecting mirror to produce parallel rays, which are applied to a color active matrix liquid crystal display unit. The parallel rays having passed through the liquid crysta... | 11/20/1990 |
| 4969732 | Display device A display device includes equipment for projecting light onto a surface. The equipment includes a beam-splitter for effecting partial reflection and partial transmittance of an incident beam. On one side of the beam-splitter are a light source for directi... | 11/13/1990 |
| 4952053 | Transparency overhead projector The invention concerns a transparency overhead projector having an illumination unit of which the height has been extremely reduced. The main component of the illumination unit is a specular surface comprising mutually parallel, mirrorized prismatic shoul... | 08/28/1990 |
| 4921343 | Overhead projector A variable power reflectory type overhead projector for forming a projected luminous beam by lighting a reflecting mirror from the projecting lens side. A transparent film-to-be-projected support is provided between a regular position of the film to be pr... | 05/01/1990 |
| 4867555 | Retrofocus lens for overhead projector A four-element inverted telephoto projection lens assembly for use in conventional overhead projectors is disclosed. The lens assembly features a reduced projection distance from the lens assembly to the projection screen while retaining the same back foc... | 09/19/1989 |
| 4863263 | Overhead projector A overhead projector including a projection lens and a deflection mirror for directing the light projected from the lens toward a screen, both the lens and the mirror being individually pivotally movable about horizontal axes parallel to each other and to... | 09/05/1989 |
| 4846570 | Overhead projector An overhead projector which has a stage for supporting an original thereon comprises an optical system for collecting light to the entrance pupil of a projection lens and a movable mirror for directing light from an illumination light source to an optical... | 07/11/1989 |
| 4838686 | Projector apparatus Projector apparatus including a light source, a projection head and a projection stage aperture for an object, the image of which is to be produced. The aperture is situated in the ray path between the light source and the projection head. An ellipsoidal ... | 06/13/1989 |
| 4814800 | Light show projector A light show projector is provided for use in producing a pleasing and variable laser-like visual line pattern on a wall or the like in synchronized relation with an audio input signal such as music. The light show projector comprises a compact and portab... | 03/21/1989 |
| 4795252 | Overhead projector A portable overhead projector has a top surface which slopes downwardly from the rear wall to the front wall and includes stops on the top surface adjacent to the front wall for preventing a transparency from sliding off the top surface during use and to ... | 01/03/1989 |
| 4736214 | Apparatus and method for producing three-dimensional images from two-dimensional sources A three dimensional image generating system has a multiple adjacent image generating projector aimed at corresponding juxtaposed reflectors, one of which being substantially reflective and the other of which being partially transmissive and partially refl... | 04/05/1988 |
| 4735499 | Film carrier support mechanism for film projector A film carrier support mechanism for a film projector of the type having an upper cylindrical member for accommodating a light source, and a lower cylindrical member for accommodating an optical arrangement for projection. The light source is adapted to p... | 04/05/1988 |
| 4711544 | Display system for vehicle A display system according to the present invention is provided with a projective display unit for projecting a display image of a display device which displays various data, onto a front glass of the vehicle and forming a virtual image of the display ima... | 12/08/1987 |
| 4680522 | Radiation path axis directing system A radiation path directing system, such as sighting means 10, (FIG. 1) has an imaging detector (not shown) below the apparatus has a field of view centered on a sightline deflected from the vertical axis 22 by mirror 12 rotatable in elevation about axis 1... | 07/14/1987 |
| 4634246 | Automatic focus for overhead projector An overhead projector includes a projection head which contains a pivoting mirror and a pivoting projection lens interconnected by a linkage. Rotation of the mirror causes rotation and translation of the projection lens and automatically corrects for Sche... | 01/06/1987 |
| 4497015 | Light illumination device A device for providing an illumination of an object includes first and second optical integrators disposed on an optical axis in spaced-apart relationship. Light rays emitted from a point light source formed by an elliptical reflector mirror having a ligh... | 01/29/1985 |
| 4492442 | Three dimensional projection arrangement A projection arrangement for projecting three-dimensional images of objects into space. The object is illuminated by a source of light, and the light rays reflected from the object are directed so as to be incident on a mirror surface located behind a len... | 01/08/1985 |
| 4466717 | Optical system for lantern slide projection This invention relates to an optical system for lantern slide projection, especially for star projectors in planetariums, with the aim of increasing the available light for the projection. The development consists in attaining an increase in brightness an... | 08/21/1984 |
| 4457600 | Light projection systems A light directing system includes a reflector whose shape in the direction from pole to open end varies from parabolic to elliptical with successively nearer remote foci. The output of the reflector is focused to a common focal point in a lens whose magni... | 07/03/1984 |
| 4408850 | Drawing table The present invention provides a drawing table for use in the fields of drafting, architecture, computer graphics, and graphic arts and the like wherein the drawing table includes means allowing projection of an optical image from below onto the working s... | 10/11/1983 |
| 4327975 | Light-beam-projecting apparatus A light-beam projecting apparatus usable in connection with sound-producing equipment for creating, on a remote surface, infinitely varying light-impingement patterns which are directly related to the instantaneous sound. The device includes a light beam ... | 05/04/1982 |
| 4252423 | Image projector An ommateal image projector of a type, in which a single or a plurality of rows of the so-called bar lenses having a longer length in the direction of its optical axis than the effective lens diameter thereof are arranged, each bar lens projecting a parti... | 02/24/1981 |
| 4235535 | Apparatus for projection on a cylindrical screen The projector includes a housing with a projection path duct holding a dove prism and a mirror deflecting the path into a vertical axis. The beam in that path is intercepted by a tiltable mirror held in a rotatable disk. A transmission which includes beve... | 11/25/1980 |
| 4227785 | Light image translator A device for manipulating visual images such as those provided by a common slide projector, employing an audio transducer apparatus for controlling positioning of a mirror in response to vertical and horizontal control signals. Numerous control signals in... | 10/14/1980 |
| 4206984 | Overhead projector A projector comprises a base carrying a working surface for matter whose image is to be projected and a side stand on which a casing is mounted, extending over the working surface, the casing having a two part lamp housing with the upper part carrying a r... | 06/10/1980 |
| 4171883 | Television projector and stand device and methods of making and using the same The present invention relates to the combination of a projector and television stand proximate thereto which allows the picture from a conventional television set to be magnified and projected upon a suitable surface and includes a stand provided with ang... | 10/23/1979 |
| 4120574 | Portable microfilm reader Portable microfilm reader having a body with a microfilm holder, a projection lamp, a foldable reflecting mirror, a hinged cover, and a projection surface or screen on the inside of the cover. The invention provides means for automatically erecting the mi... | 10/17/1978 |
| 4114997 | Navigational device A film projection device having a screen, light source, lens and mirror system and a reference indicator disposed immediately in front of the mirror for shadow casting a reference line onto the image of a film projected onto the screen via initial project... | 09/19/1978 |
| 4080052 | Overhead projection system with lens assembly having concentrically-oriented condensing lenses An overhead projection system which includes a planar lens assembly having two concentrically-oriented condensing lenses. The outer lens has a greater focal length than the inner lens to receive light reflected from the system's reflector while the inner ... | 03/21/1978 |
| 4066887 | Segmented sectional reflection for the projection of light beams and its method of production A projection system, such as a slide film or motion picture projection system, includes a light source, a reflector, a film gate or aperture, and a screen. The reflector is formed from a deep-dish ellipse reflector by cutting the ellipse into at least thr... | 01/03/1978 |
