Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4166694 | Method for optically distorting readout reticles A method for preparing distortion-compensated images on film reticles for e in a plural optical projector readout unit. An oversized matrix of the images is prepared with each legend proportionately positioned in the field of view corresponding to one of ... | 09/04/1979 |
| 4165161 | Multiple optics slide projector The projector includes two projection optics systems and two slide gates which move slides acquired from a slide receptacle into and out of a viewing position in all of the projection optics systems. The slide gates are movable between a first position, w... | 08/21/1979 |
| 4129365 | Wide angle anamorphic display projection system The invention is a compact, low-cost optical arrangement providing a wide-angle, anamorphic, short-throw image projector and display system. The device includes novel circular cylindric mirrors whose focal lengths may readily be adjusted. Temperature and ... | 12/12/1978 |
| 4127324 | Dual photographic slide projector A double slide projector having two slide projection assemblies, a common magazine for slides, and a common slide changer, uses a motion transmitting arrangement from a drive to the changer so that the changer is moved a full stroke for moving slides from... | 11/28/1978 |
| 4125321 | Apparatus for projecting light images An apparatus for projecting images simulating the phenomenon of combustion on a display media is provided with a control means for quickly positioning, expanding, and diminishing the images. Light from a light source is passed through orange and grey tran... | 11/14/1978 |
| 4116553 | Display method and apparatus A display apparatus and method for comparing color combinations for carpet, drapery and wall decorating, consisting of a screen, light passages and projectors for directing images through the passages onto the screen. Observers compare the color scheme re... | 09/26/1978 |
| 4097134 | Projection device A projection device provided with at least two different enlarging projection systems for the projection on a screen of a set of at least two slides provided on one carrier, said slides covering the same area of a plan or map, one slide being more detaile... | 06/27/1978 |
| 4087167 | Dual photographic slide projector A dual or twin projector arranged to take picture slides from a single magazine located between the two projectors, and to return the slides to the same magazine after projection, in proper order ready for another projection operation. The planes of the p... | 05/02/1978 |
| 4086005 | Audio-visual programmer A multimedia motion picture and photographic slide projection control apparatus which permits a plurality of projector devices to be controlled from an operator's console. Manually operable switch means, operating through digital control means, develops a... | 04/25/1978 |
| 4076399 | Control mechanism for a plurality of slide projectors A control system for the control of special functions in multiple projector systems is disclosed. The system can effect fading, blending and mixing at different speeds in forward and reverse projector directions. The system includes a freely programmable ... | 02/28/1978 |
| 4067647 | Dual film strip projector A dual film strip projector projects images onto at least one screen from a pair of film strips, each of which is advanced in programmed timing independently of the other. The film strips are contained in a cartridge that is readily insertable in the proj... | 01/10/1978 |
| 4063465 | Magazine feeding mechanism for dual slide projectors Mechanism for feeding a picture slide magazine in such a way that picture slides can be taken out of the magazine in the same order in which they are placed in the magazine, for delivery to two separate projector units of a dual slide projector, and then ... | 12/20/1977 |
| 4060318 | Projection apparatus A projector for projecting a movable spot of light onto a screen includes a pair of plates mounted adjacent and parallel to each other, each plate being opaque, apart from a straight slot. The slots cross one another at a crossing point defining an apertu... | 11/29/1977 |
| 4059348 | Objective plotting of visual fields by eye movement monitoring An apparatus for measuring and evaluating a subject's visual field presents a target image, consisting of a spot of light, at a series of selected locations within the subject's visual field. Means are provided to monitor his resulting eye movement and po... | 11/22/1977 |
| 3985431 | Credit card validation aid A device operative with endless loop cartridges containing reflective microfilm lists of invalid credit cards is configured for receiving at a bank of slots separate cartridges to be supplied by each credit organization. A credit card holder has plural gu... | 10/12/1976 |
| 3956579 | Program schedule displaying system Television programs schedules and visual time information are displayed by projection of composite images from the frames of a film strip and slides respectively displaced in synchronism on a cyclic basis and unidirectionally advanced at the end of each r... | 05/11/1976 |
| 3951527 | Target image projector An apparatus for measuring and evaluating a subject's visual field includes a projector for presenting a target image, consisting of a spot of light, at a series of selected locations within the subject's visual field. A mirror is mounted for movement abo... | 04/20/1976 |
| 3944351 | Apparatus for superimposing a plurality of images An apparatus for producing a multiplicity of projection light images in which the ideal planes of said images are adapted to be parallel to the screen by permitting a projection lens, a photographic transparency and a light source filament constituting pa... | 03/16/1976 |
