Bizarre Patents
A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 4801183 | Infra-red optical systems An infra-red optical system, such as an afocal telescope, having a beam-splitter plate located in a beam position having one valve of numerical aperture and tilted with respect to the optical axis has a single compensating plate located in a beam position... | 01/31/1989 |
| 4772942 | Display system having wide field of view A display system which can be used inside a vehicle such as a military tank to monitor at least part of the surrounding panorama. The display system has a display generator and an optical system for viewing the display. Electronic means are provided to pr... | 09/20/1988 |
| 4457461 | Head mounting apparatus Head mounting apparatus which can accommodate different head sizes and shapes comprises a substantially rigid member for supporting equipment, such as night vision equipment, to be used by the wearer, and a flexible member which can flex to adapt to the h... | 07/03/1984 |
| 4432596 | Infra-red optical systems An "eye-piece" system for an infra-red afocal telescope comprises a back element of positive power having a convex front surface and a curved back surface, and a pair of elements closely spaced to define a gas lens therebetween, the front element of the p... | 02/21/1984 |
| 4398799 | Head-up displays In a head-up display system by which visual information from a display is superimposed by means of a combiner on a pilot's view of the outside scene, the pilot's view is recorded by a head mounted camera to which light from the outside scene and superimpo... | 08/16/1983 |
| 4399430 | Intruder detection security system A security system having a mesh-like intruder detection structure for use as or with a security fence 2 or for detecting intruders jumping down from a fence or wall. The structure is made up from a number of elongated members (4, 6, 8, 10, 12, 14) each in... | 08/16/1983 |
| 4383727 | Infra-red optical systems An "eye-piece" system for an infra-red afocal telescope comprises a positive back element having a concave or convex back surface and a convex front surface, and a pair of elements closely spaced to define a gas lens therebetween, the back element of the ... | 05/17/1983 |
| 4376889 | Low light level vision apparatus Low light level or night vision apparatus, and particularly goggles, having an objective lens to focus incident light on to an image intensifier and a magnifier enabling an observer to view a magnified version of the intensified image includes a wavelengt... | 03/15/1983 |
| 4329024 | Objective lenses The invention provides an objective lens with a front lens group and a rear lens group spaced apart from the front group. The front group comprises at least two doublet components one of which is a crown positive element cemented to a flint negative eleme... | 05/11/1982 |
| 4322135 | Optical apparatus Optical apparatus for biocular viewing which is small and of light weight comprises a solid optical element having a face which internally reflects light from an image surface to internally concave reflecting areas which reflect the light back to the face... | 03/30/1982 |
| 4261635 | Optical apparatus Optical apparatus, such as head-up display apparatus, for superimposing visual information on an observer's view of a scene or object comprises a substantially flat transmission hologram through which the observer views the scene or object, the hologram b... | 04/14/1981 |
| 4200366 | Microform readers The invention provides a portable reader for reading, by way of a magnified image, microform material such as microfiche or microfilm. The reader has a support for the microform material and a light source to pass light through the material. A projection ... | 04/29/1980 |
| 4199217 | Infra-red optical systems The "eye-piece" for a non-Gallilean afocal infra-red telescope comprises a front element which is meniscus with a convex back surface of greater radius of curvature than its concave front surface but which has a thickness such that it is of positive power... | 04/22/1980 |
| 4183624 | Lenses A biocular magnifying lens suitable for use as an eyepiece in a night vision device comprises from front to back a positive element which is bi-convex or meniscus convex towards the front, a negative meniscus element concave towards the front, a positive ... | 01/15/1980 |
| 4183626 | Lenses The invention provides a telephoto lens with a positive front group of lens elements, a negative middle group of lens elements and a rear positive part comprising a lens element or group of lens elements. The front group of elements includes at least one ... | 01/15/1980 |
| 4178075 | Lenses with distortion An objective lens particularly for use in a low light level or night vision system designed to introduce a controlled amount of barrel distortion at the edges of its field of view to permit use with a flat input faced imaging tube.... | 12/11/1979 |
| 4148548 | Temperature compensating focusing in infrared zoom lenses This invention provides a lens which operates in a waveband in the infra-red region of the electromagnetic spectrum and which has a variable focus or magnification. The invention relates particularly to an infra-red zoom lens. The lens has a front part an... | 04/10/1979 |
| 4030805 | Infra-red lenses An infra red lens of very high aperture greater than F/0.75 specially adapted to transmit a waveband in the infra red range comprises from front to back in the order given (a) at least one positive meniscus element convex towards the front, (b) a negative... | 06/21/1977 |
