Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 4487483 | Catadioptric objective The invention relates to a compact, high-aperture, catadioptric objective. Such an objective comprises a negative lens, a main mirror disposed on the peripheral area of a surface of this lens, a positive front lens, a counter mirror facing the main mirror... | 12/11/1984 |
| 4315185 | Vacuum-tight, electrical connection for the photocathode in an image intensifier tube Electrical connection for the photocathode in an image intensifier tube, said photocathode being present on the input window of the image intensifier tube, and which input window is secured by means of a layer of vacuum-tight material, e.g. frit, to a met... | 02/09/1982 |
| 4303160 | Package for single film stack A package which loads a stack of single films into an internally bladed daylight cassette, has a waisted middle part accommodating the stack, a strip for retaining the package in the cassette, a transverse weld following the retaining strip, a pull tab fo... | 12/01/1981 |
| 4275326 | Image intensifier tube with a light-absorbing electron-permeable layer An image intensifier tube has a light-absorbing electron-permeable layer covering an aluminum film overlying a layer of luminescent material in the anode structure of the tube. The light absorbing layer is silicon or boron, or a compound of silicon or bor... | 06/23/1981 |
| 4266129 | Device for viewing residual light in the visible and the near infrared spectrum A device for binocular viewing of residual light in the visible and the near infrared spectrum, comprising an optical input system, at least one singular image intensifier of the non-inverting type, a collimator, two ocular paths parallel with the axis of... | 05/05/1981 |
| 4253028 | Device for positioning X-ray films and intensifying screens A pair of intensifying screens are spread apart to accept X-Ray films and then brought together again with this film sandwiched between them ready to be exposed. The device consists of a deflector and feed channel for deflecting and holding one of the scr... | 02/24/1981 |
| 4232222 | Binocular night glass An improved binocular night glass suitable for use with infrared light and relatively low levels of visible light without changing the viewing system, in particular its prism system. According to the invention the improvement comprises that the image conv... | 11/04/1980 |
| 4227687 | Apparatus for separating and removing a sheet from a stack of such sheets Apparatus for separating and removing a sheet from a stack of such sheets is provided with a reciprocating pushing member engaging the trailing edge of the lowermost sheet in the stack to push the same into contact with transport means capable of engaging... | 10/14/1980 |
| 4226512 | Film projection system A film projection system comprising a film guiding path, a light source, a projection screen and a rotatable optical system. The optical system comprises a support carrying equidistant identical object lenses whose nodal points traverse a path spaced from... | 10/07/1980 |
| 4201797 | Process for applying a light-absorbing, electron permeable layer within an image intensifier tube A process for applying within an image intensifier tube, in particular one of the proximity-focus type, a light absorbing, electron permeable layer on to a film coated on a layer of luminescent material applied to the anode of the tube. The layer is appli... | 05/06/1980 |
| 4200931 | Signal processing system A system for synthesizing a radiation divergence correcting operation and a deconvolution operation, for use in a tomographic apparatus, comprising optical storing means for a collection of primary signal profiles in analog form obtained by exposing a sub... | 04/29/1980 |
| 4191890 | Synthetic aperture scanner for decoding a coded image produced by penetrating radiation, such as X-rays A system for decoding a coded aperture image of an object exposed to short-wave radiation from a plurality of point sources positioned in space in accordance with a given distribution. The coded aperture image is displayed by a cathode ray tube having its... | 03/04/1980 |
| 4124269 | Scanning system with improved radiation energy collecting capabilities A scanning system for use in an air-borne vehicle and adapted for collecting and focusing radiation received by periodically scanning a strip of the ground from which radiation energy is being collected extending tranversely to the course of flight, compr... | 11/07/1978 |
| 4111528 | Magnifier A magnifier having a relative aperture exeeding f/1, an angle of view wider than 2° × 25°, and a pupil distance longer than 0.9 f, in particular for viewing the anode screen of an image intensifier tube forming part, for example, of a viewing device mo... | 09/05/1978 |
| 4061923 | Receptacle for radiographic film material A receptacle for radiographic film material comprising a first fluorescent screen disposed in a first path of movement extending around a first pair of rollers, and a second fluorescent screen disposed in a second path of movement extending around a secon... | 12/06/1977 |
| 3935461 | Scintillating camera The invention relates to a scintillating camera and in particular to an apparatus for determining the position coordinates of a light pulse emitting point on the anode of an image intensifier tube which forms part of a scintillating camera, comprising at ... | 01/27/1976 |
