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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7854515 | Projection type image display apparatus An projection type image display apparatus includes a projection optical system having a plurality of concave mirrors and digital micromirror device (DMD). An optical path from the DMD to the concave mirror closest to the DMD is a sealed space which is surrounded by... | 12/21/2010 |
| 7374292 | Image projection table An image projection table including: a projector which projects an image; a housing in which the projector is housed; and a top plate on which the image projected from the projector is projected, wherein the top plate includes an operational part for operating the p... | 05/20/2008 |
| 7309131 | Projector When a front cover 12 in which an inner grille 13 is fitted is mounted to the body of the projector, a fin member 13b formed as one unit with the inner grille 13 is placed with very little clearance between itself and a partition | 12/18/2007 |
| 7300163 | Slide misload detection system and method A system and method for determining whether one or more slides are loaded properly within a cassette. Each slide includes one or more transparent regions and one or more non-transparent regions. The slides are between a light source and a sensor. The light source ge... | 11/27/2007 |
| 7293876 | Light source unit and projector It is an object of the present invention to provide a light source unit that can supply bright light efficiently. The light source unit includes a light emitting unit that emits light, a phase plate that polarizes the light from the light emitting unit to produce a ... | 11/13/2007 |
| 7241015 | Optical unit and projection type image display unit using it An optical unit includes a light source, a color separator, reflection-type image display elements, a color synthesizer, a reflection-type polarization plate, and an optical chassis. The optical chassis holds the reflection-type polarization plate and the reflection... | 07/10/2007 |
| 7237902 | Apparatus and method for projection type display There is provided a projection display device with an angle shifter, in which the picture quality can be improved by reducing a visual pixel gap between an imaging element and a projection lens. The projection display device includes a light source for emitting a li... | 07/03/2007 |
| 7195388 | Light source device and projector apparatus having same According to the present invention, there is provided a light source device having a reflector including a light source lamp and an opening for emitting light for reflecting light radiated from the light source lamp arranged within the reflector to emit the light fr... | 03/27/2007 |
| 7057578 | Active projection screen A screen (which may be a display or electronic display) for projection that has embedded in the screen other active display technologies, such as LEDs, LCDs, etc., or the screen itself is a hybrid of translucent surfaces with a low-resolution display. This display w... | 06/06/2006 |
| 7029128 | Table type display device A table type display device, in which a high resolution display with an unremarkable connection is realized at the time of large screen display by using a screen with a composition having few bending is described. In a table type display device comprising plural M o... | 04/18/2006 |
| 6964482 | Optical rod, manufacturing method of optical rod, manufacturing jig of optical rod, and projector equipped with optical rod A tubular body having a substantially rectangular cross-section is formed with a plurality of flat plates each having a surface with a light reflecting coating applied thereto. To form the tubular body, the flat plates are disposed in such a manner that the surfaces... | 11/15/2005 |
| 6734838 | Enhanced resolution for image generation Images with enhanced resolution are created with a display device comprising a non-transmissive light valve including addressable pixels, a light source that directs light to the light valve, and a lens positioned between the light valve and the light source, the le... | 05/11/2004 |
| 6550922 | Audio-video recording of overhead projector based presentations The present invention relates to the audio-video recording of overhead projector based presentations. The apparatus (1) comprises an audio microphone (29), a logging element (20, 21, 27) for logging when a presenter changes a viewable object such as an ov... | 04/22/2003 |
| 6199987 | Optical device, and projection display device including the same To increase the usage efficiency of the light of optical elements used in a projection display device, a polarizing conversion unit is provided. This polarizing conversion unit consists of a unit frame, two polarizing conversion element arrays, a light-sh... | 03/13/2001 |
| 6137635 | Projector apparatus To correct on-axis chromatic aberration of a projection lens easily and at low cost by using a transparent plate between an optical modulator for a primary color component and a beam combining optical system. When a standard projection lens 11 having a me... | 10/24/2000 |
| 5915818 | Image input apparatus An improved image input apparatus 1 prevents foreign particles from attaching onto image reading areas of transparency media contained within the apparatus by providing feeding block structure 13 that substantially covers an area between a loading cartrid... | 06/29/1999 |
| 5662400 | Projection display system Disclosed is a condenser lens with large aperture, having a numerical aperture of 0.9 or larger, which consists of a bi-aspherical single lens having a first surface of convex form facing the larger conjugate side and a second surface facing the smaller c... | 09/02/1997 |
| 5367350 | Overhead projector illustration slate The overhead projector dry-erase accessory of this invention comprises a transparent, rigid, multi-layered body (12) into which overhead transparencies can be placed and utilized. The multiple layers of the device are created by either folding a single pi... | 11/22/1994 |
| 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 |
| 4704019 | Microfiche carrier A microfiche carrier has a lower transparent plate supporting a microfiche thereon and changeable over into a horizontal posture and an inclined posture, an upper transparent plate openable and closable relative to the lower transparent plate and urging t... | 11/03/1987 |
| 4143953 | Microfilm reader Microfilm is inserted between two or more parallel, transparent, laterally invertible support plates placed in a light path emanating from a light source and travelling to a projection objective. The plates are placed in a tray which can be slided in two ... | 03/13/1979 |
