Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 6678345 | Reactor pressure vessel and process for temperature equalization in a reactor pressure vessel A reactor pressure vessel with an upper support plate, in which an equalization opening is provided as a bypass is described. A process for temperature equalization between an upper dome chamber above a support plate and a lower chamber below it is descri... | 01/13/2004 |
| 6167197 | Camera with frame shift prevention during exposure A camera comprising a main body part with spaced film supply and film take-up chambers and an exposure opening located between the film supply and take-up chambers and configured for exposing an unexposed film frame, a metering pawl for engaging a film pe... | 12/26/2000 |
| 6092936 | Metering/re-cocking member for engaging film during exposure and for re/cocking shutter actuator, separates from shutter actuator when re-cocked A camera comprising a shutter blade supported to move open to expose a frame on a filmstrip, a shutter actuator supported for movement to move the shutter blade open and for movement to be re-cocked, an actuating spring for urging the shutter actuator to ... | 07/25/2000 |
| 6049678 | Camera preventing film movement in stopped state A camera comprises a first device which makes a head and a film closer to each other, the head being arranged to perform at least either one of recording and reading information on and from the film, a second device which prevents the film from travelling... | 04/11/2000 |
| 5963747 | Photographic recording or reproducing device and film cartridge having movable sealing member for sealing film entrance opening thereof The invention relates to a photographic recording or reproducing device, preferably a camera, with a transportation device for the frame-by-frame transportation of a film along a film transportation path and with a film measuring device with an engagement... | 10/05/1999 |
| 5897222 | Disabling mechanism for holding metering sprocket disengaged from filmstrip to permit final film winding into cartridge in camera A camera comprising a film winder rotatable in engagement with a film spool inside a cartridge to wind an exposed filmstrip into the cartridge, a frame counter rotatable to indicate the number of exposures remaining for picture-taking and having a circula... | 04/27/1999 |
| 5887209 | Camera containing a frame shift prevention member and method A camera that prevents frame shifting without hindering a film feeding. The camera includes a cartridge chamber housing a film cartridge, a film passage forming member, a film passage restricting the film in accordance with the film passage forming member... | 03/23/1999 |
| 5881330 | Apparatus for metering strip of film A metering apparatus for metering a strip of film along a film transport path in a camera. The apparatus provides for the initial positioning, metering, and rewinding of the filmstrip. A movable metering member has at least one tooth adapted to engage a p... | 03/09/1999 |
| 5832322 | Photographic camera with a frame counter in the back A camera includes a main body having a first cavity for receiving a film cartridge and a second cavity for receiving film withdrawn from the film cartridge, a metering apparatus mounted within the main body for metering the film, one frame at a time, betw... | 11/03/1998 |
| 5790900 | Photo film, photo film advancing device and lens-fitted photo film unit for use with the same Photo film has pairs of perforations arranged at a regular pitch (L1+L2) along at least one edge thereof. Each of the pairs of perforations includes first and second perforations arranged at a small regular interval (L1) away from one another. A photo fil... | 08/04/1998 |
| 5742676 | Circuit for telephone set comprising a light-emitting diode power supply A circuit comprising a transistor (T1) is connected in series to a resistor (RM) for measuring the line current; the whole is connected to the terminals (1,2) of the line. According to the invention, a light-emitting diode (18) is connected in series to a... | 04/21/1998 |
| 5708888 | Camera with a frame shift prevention function A camera that reliably prevents frame shifts of film by inserting a frame shift prevention member into a film perforation is disclosed. The camera with a frame shift prevention function includes a frame shift prevention member that is supported to move to... | 01/13/1998 |
| 5678109 | Camera interior light lock A camera includes a frame having a movably attached film engaging member including a metering pawl for engaging a contained filmstrip. A light locking cover attached to the frame prevents ambient light from entering a defined light tight enclosure surroun... | 10/14/1997 |
| 5585877 | Sprocket mechanism for cameras A sprocket mechanism for cameras adapted for advancing a film provided with two juxtaposed sprocket holes at regular space intervals includes a sprocket with a body having a couple of pawls spaced apart at a pre-determined distance at a circumferential ri... | 12/17/1996 |
| 5555053 | Metering apparatus A metering apparatus for a filmstrip forms with at least one perforation for each film frame including a metering member which is configured for engaging at least one perforation for each film frame, so as to prevent the filmstrip from moving in a film ad... | 09/10/1996 |
| 5508771 | Apparatus and method for stopping film advance An apparatus for stopping photographic film advance upon encountering an end-of-roll perforation at the end of a roll of film. In one embodiment, the apparatus includes a camera body defining a film track for slidably receiving film, a camming member mova... | 04/16/1996 |
| 5357302 | Apparatus for feeding photographic film having two perforations per frame A film feeding apparatus of a camera using a film having two perforations in each frame. A perforation detecting lever has claws spaced at a predetermined distance apart from each other so that the distance therebetween is equal to the distance between th... | 10/18/1994 |
| 4685788 | Film registration apparatus A camera for use with a photographic element having a plurality of the exposure frames each having a registration perforation arranged in a predetermined relationship one with each frame. The camera is provided with an improved registration or metering me... | 08/11/1987 |
| 4107715 | Filmstrip metering device for a camera A camera has a device for metering a filmstrip having a filmstrip metering perforation in each frame thereof, the filmstrip being locked for each frame by moving a sensing member provided on the camera body into engagement with the filmstrip metering perf... | 08/15/1978 |
| 3984852 | Exposure counter for an automatic camera An exposure counter for use in a camera which provides a user with information as to the number of remaining exposures within a film cassette positioned therein. The exposure counter includes a drum or cylinder which is coupled to one member of a gear tra... | 10/05/1976 |
