In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 5975773 | Photographic processing apparatus A compact integrated system for film and print processing has chemical processing trays, sink, water filter and faucet, chemical storage, and drying screens integrated into a single multi-purpose unit. The processing trays are vertically stacked and rolle... | 11/02/1999 |
| 4839684 | Photographic tray agitator A photographic tray agitator is set forth wherein an oscillating arm is cycled to maintain a photographic tray of chemicals constantly agitated for enhancing photographic development. A coil spring is wound within a housing to operate a clockwork that eff... | 06/13/1989 |
| 4511230 | Photographic processing apparatus including a rocking platform and a rolling developing tank A photographic processing apparatus for uniformly processing roll film and photographic sheet material in a rolling stainless steel tank. The tank rolls back and forth along a platform that is tilted one way, and then the other, by means of an air bellows... | 04/16/1985 |
| 4492447 | Apparatus for developing photographic material Photographic developing apparatus is described which includes a tray for receipt of photographically sensitized material to be developed having a light tight lid to form the processing tank and a raised annular foot on the underside of the tray. The appar... | 01/08/1985 |
| 4474444 | Method and apparatus for processing photographic materials by transferring processing liquids one by one to a processing receptacle Materials such as photographic material is processed by supplying successive processing liquid baths to a processing receptacle. These baths are initially filled into a first series of receptacles and are simultaneously transferred to a second series of r... | 10/02/1984 |
| 4364655 | Photographic darkroom control system with timing means Process timing and controlling system for use in photographic darkrooms involving multiple timing and control process steps including a control console, programmable in at least one channel to step through substantially all timing and control process step... | 12/21/1982 |
| 4198153 | Processor for printing plates A semiautomatic apparatus for processing the imaged surface of a printing plate. The apparatus includes an enclosed tray in which a plate is processed and a storage tank for processing liquid. In a processing cycle, the tank and tray are moved in timed se... | 04/15/1980 |
| 4184777 | Agitator An agitator for use in developing photographic film has an upright oscillatable shaft with a platform at its upper end for supporting a developing tank, spring means urging the upright shaft to a neutral position, a motor-driven shaft normal to the uprigh... | 01/22/1980 |
| 4157868 | Photographic processing tray A photographic developing tray is described having such configuration as to provide, when placed at an angular position, a trough adapted to contain a certain amount of processing solution. The inner wall of the trough, so formed, has a predetermined slop... | 06/12/1979 |
| 4142193 | Film storage and developing cassette A film storage and developing cassette comprising a closed elongated flattened box-like structure having top and bottom panels, side walls and end walls defining a generally closed light-proof enclosure, and film storage compartment means within said box-... | 02/27/1979 |
| 4138689 | Rockable photographic tray having a substantially flat interior sheet support A photographic tray having inwardly turned upper edges, ribs along the lower surface thereof for making the tray more rigid and upwardly sloping bottom surface portions on which the tray may be rocked to agitate a liquid located therein is fabricated as a... | 02/06/1979 |
| 4123176 | Photographic developer turning system A photographic developer turning system for periodically turning a film processing container. An electric motor connected to an output shaft is mechanically coupled to a clamp disposed about a cylindrically shaped film processing container. The motor turn... | 10/31/1978 |
| 4026531 | Photographic chemical liquid agitator A tray container for liquid chemical compositions such as those used in developing photographs or pictures, is pivotally carried on a support for tilting or rocking movement. A spring biased support means is disposed under one end of the tray and a motor ... | 05/31/1977 |