Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7310184 | Cylindrical body of a Newton reflective telescope A cylindrical body of a Newton reflective telescope includes a first cylindrical body and a second cylindrical body combined together. The first cylindrical body has an eyepiece fixed on an outer surface, and a reflective mirror fixed in its interior. A joint member... | 12/18/2007 |
| 7060961 | Image sensing element and optical instrument having improved incident light use efficiency An image sensing element having a high refractive index part that covers at least a portion of each of a plurality of photoelectric converters arranged in one or two dimensions and a low refractive index part provided on the periphery of the high refractive index pa... | 06/13/2006 |
| 6779305 | Door viewer plug A conventional commercial door viewer includes a lens at one end for providing a wide angle view and a hollow end through which a person would look. A truncated cone shaped plug fits within the hollow end to block light transmission through the door viewer. The plug... | 08/24/2004 |
| 6201642 | Vehicular vision system with a wide angle lens including a diffractive element A wide angle imaging system for providing a wide angle field of view area exteriorly of a vehicle comprises an outer negative or wide angle group of lenses for receiving the wide angle field of view and directing a virtual image toward a positive, converg... | 03/13/2001 |
| 6082869 | Door/window mounted safety mirror The present invention 10 discloses a safety mirror 10 designed to be attached to the outside of an outwardly opening door 14 and to be viewed from the inside of the door by the user 12 looking through the fireproof door window 18. The safety mirror 10 has... | 07/04/2000 |
| 6073335 | Method for providing a door ornament support A method of supporting an ornament on the exterior of a door uses a peep hole fixture to mount a hanger piece. The hanger piece is a flat metal strip having a hole in one end sized to be received on the peep hole fixture barrel while being captured by a f... | 06/13/2000 |
| 5867318 | Wide-angle optical system An optical system affords wide-angle imaging with a width in azimuth and a height in elevation respectively greater than and less than those of the field of view of an imaging device to which it is fitted. A median optical axis images a central format vie... | 02/02/1999 |
| 5851700 | Filter for liquid crystal display device A filter for a liquid crystal display device, having a light diffusing plate which is obtained by forming a composition in the form of a film which contains at least two photopolymerizable oligomers or monomers having refractive indexes which differ from ... | 12/22/1998 |
| 5786935 | Scope A scope apparatus is provided with an image forming optical system and a condenser lens on the exit side of the image forming optical system. The condenser lens is positioned so that a convex exit surface thereof is disposed in the vicinity of the image p... | 07/28/1998 |
| 5550673 | Spyhole viewer A spyhole viewer for a door or wall, includes an objective system for producing a real, inverted image. The objective system is mounted in a tubular member fixedly installable in the door or wall. An erector is provided for inverting the inverted image of... | 08/27/1996 |
| 5357367 | Spyhole viewer A spyhole viewer, mountable in a wall surface is disclosed and provides a wide angle view, while requiring a small diameter mounting hole. An objective lens system produces a real inverted image, a reflector angularly deflects light from the objective len... | 10/18/1994 |
| 5262901 | Door viewer A viewing device for installation on a wall or door includes a housing projecting from the front surface of the door and defining a plurality of surveillance ports disposed axially, and non-axially relative to the axis of the housing. By means of a knob e... | 11/16/1993 |
| 5221992 | Door viewer including inner tube encasing object lenses and ocular lens and including a rubberized flexible hood A doorscope comprising an inner tube which encases two sets of lenses, the one set being the object lens set, encased in the outer, or external portion of the doorscope, and composed of two opposed and adjacent concave lenses, and the other lens being an ... | 06/22/1993 |
| 5214533 | Portable monocular with high magnification The portable monocular comprises an elongate body in two parts (2,3) at one end of which is fixed an eyepiece (1). At its other end the elongate body encloses two biconvex lenses (4,4') of equal power arranged in grooves (5,5'). The distance (A) between t... | 05/25/1993 |
| 5078470 | One-way peephole A door-mounted security peephole providing an undistorted view over a relatively large area by use of a beam splitter optical system. The peephole comprises a door-mounted housing containing a beam splitter and light source arranged so that light is refle... | 01/07/1992 |
| 5044738 | Wide angle viewing system An optical system for scanning a wide angle conical field of regard through a small aperture and with a narrow field of view device includes a first optical offsetting device rotated about a first axis coincident to the axis of the conical field of regard... | 09/03/1991 |
| 4964710 | Disposable rigid endoscope An endoscope is provided with an objective lens system, an ocular lens and an intermediate relay lens system. The relay lens system is a hybrid system using both plastic and glass elements. The plastic elements comprise an even plurality (N) of axially al... | 10/23/1990 |
| 4932765 | Optical device providing supplemental wide angle peripheral vision A field of vision enhancement device having a mounting on an article of headgear or other structure adjacent to the user, adjustable with respect to a straight ahead, normal line of sight including optics for displaying at least one field of optical infor... | 06/12/1990 |
| 4809320 | Door security system A security intercommunication system is disclosed which includes an inside housing, an outside housing and a peep-hole optical assembly including a cylindrical body having first and second threadedly engagable, longitudinally aligned sections. The inside ... | 02/28/1989 |
| 4730911 | Wide angle optical viewer This invention relates to a wide angle viewing system (V) which may be inserted into a high temperature environment, in particular, a furnace or burner (F). The superior interior wide angle view (A) yields pertinent information for use in diagnosing combu... | 03/15/1988 |
| 4726670 | Security viewer A security viewer to be mounted through a non-transparent partition, e.g. a door (7), comprises a housing (1) which extends through the door. The housing includes an inlet aperture (8), a screen (13) and a lens system (9, 10, 11, 12). The lens system form... | 02/23/1988 |
| 4688943 | Fluid optical density (opacity) probe An apparatus and method for determining the extinction of laser light through a fluid is disclosed. The fluid is passed in a conduit having a light transmissive window. A laser beam having intensity I1 is passed through the window into the flui... | 08/25/1987 |
| 4523808 | Welding helmets with auxiliary optical vision systems A welding helmet with welder's glass includes one or more reducing auxiliary vision systems providing viewing of areas which would otherwise be blocked by opaque portions of the welding helmet.... | 06/18/1985 |
| 4431277 | Viewing device A viewing device for mounting in a wall or door frame to provide a view of the exterior of the building to an occupant of the building comprises a tubular housing and a pair of reflectors mounted by arms at one axial end of the housing so that they extend... | 02/14/1984 |
| 4398811 | Viewing-direction changing optical system A viewing-direction changing optical system comprising an optical fiber bundle, a reflecting means arranged to deflect the optical axis to a direction different from the axis of the optical fiber bundle, and lenses arranged in front and rear (the object s... | 08/16/1983 |
| 4348083 | Crime preventive door viewer A crime preventive optical door viewer having an assembled optical system with a field of vision of about 160 degrees is set through a door to enable viewing of the outerside from the inside of the door. The optical system includes first and second object... | 09/07/1982 |
| 4269474 | Wide-angle optical door viewer This invention provides an improvement of a wide-angle optical door viewer having a wide-angle optical system for bringing into view more than 190 degrees of vision, which is set through a wall, a door or the like to enable viewing of an object located ou... | 05/26/1981 |
| 4251127 | Wide-angle door viewer A wide-angle door viewer providing a large wide-angle outdoor view which can be zoomed and is readily perceptible without closely approaching the eyepiece, which comprises an optical lens barrel having relatively large diameter lenses in positions of reve... | 02/17/1981 |
| 4184749 | Wide angle narrow bandpass optical filter system A spherical lens element and a concentric lens element receive light, in that order, from a wide field of view, and diverge all rays so that upon leaving said concentric element, the angles of all rays approximate that of radial lines. This light is then ... | 01/22/1980 |
| 4175824 | Door viewer with barrel flange and mating lens recess Disclosed are alternative embodiments of a barrel type optical viewer for installation in a door or other type partition where the wide angle lens of the viewer is so connected with the forward barrel flange to avoid obstruction of the periphery of the le... | 11/27/1979 |
| 4172636 | Door scope A door scope provided in a door for viewing outside from inside includes an optical system consisting of five lenses: a large diameter objective having a concave rear face, two auxiliary objectives having concave rear faces, a biconcave compensation lens ... | 10/30/1979 |
| 4116529 | Wide-angle spyglass An optical spyglass of a compact dimension to be mounted in a house door or the like for providing to an interior viewer a substantially 180° wide-angle outdoor view. Its optical system comprises a wide-angle lens having a convex surface of a large radiu... | 09/26/1978 |
| 4050792 | Observation port assembly An observation port assembly, arranged to be attached to a door and to permit a panoramic view with a maximum field of view of the area outside the door, including a boxshaped part, attachable to the outside surface of the door, having at least two optica... | 09/27/1977 |
| 3973835 | Security viewing device A security viewing device which provides a viewer on one side of a door with a view of a caller whether he is standing directly outside the door or concealing himself to one side. The device includes a housing in which is mounted a stationary rotating per... | 08/10/1976 |
