The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7204607 | LED lamp An LED lamp includes: a substrate; a cluster of LEDs, which are arranged two-dimensionally on the substrate; and an interconnection circuit, which is electrically connected to the LEDs. The LEDs include a first group of LEDs, which are located around the outer perip... | 04/17/2007 |
| 7094080 | Safety device for electrical plugs and a method of attaching the same A safety device for preventing accidental contact of a user's fingers with the live blades of an electrical plug during inserting or removal of the plug from a wall socket and a method for attaching the safety device to an electrical plug. The safety device includes... | 08/22/2006 |
| 6033128 | Rolled film backing paper with cinch tabs The present invention is a photographic roll film which includes a photographic film strip and a light shielding paper secured to the photographic film strip. The backing paper has a leader which includes at least one cinch tab extending out of a plane of... | 03/07/2000 |
| 5381204 | Leader card attachable to a photographic filmstrip having a lead end with at least one aperture A leader card attachable to a photographic filmstrip having a lead end with at least one aperture. The leader card includes (1) a piece of material having a tab portion and (2) at least one hook secured to the material. The hook is sized to be extendible ... | 01/10/1995 |
| 5257065 | Apparatus for transporting exposed photographic films through and beyond a developing unit Successive exposed photographic films are connected, either individually or in groups of two or more, to discrete sheet-like leaders which are transported along an elongated first path extending through the baths and the dryer of a developing unit. The le... | 10/26/1993 |
| 5072254 | Photographic printer assembly A spool assembly for use in a printer assembly which allows substantially the entire web of photographic paper to be exposed in the printing process. The printer assembly includes a web, a printer operative to expose photographic images on portions of the... | 12/10/1991 |
| 5015089 | Leader assembly and method A bulk film loader for use in daylight conditions including a light-tight casing for receiving cartridges of film in strip form. The film for a desired number of exposures is transferred from a cartridge onto a camera film feed spool or cassette. A guillo... | 05/14/1991 |
| 5006873 | Implicit mid roll interrupt protection code for camera using dedicated magnetic tracks on film A virtually transparent magnetic layer is included as an additional layer in a color negative film. Information exchange between various users of the film--such as (for example) the film manufacturer, the camera user, the dealer and photofinisher--is carr... | 04/09/1991 |
| 4987047 | Imaging sheet roll containing photosensitive microcapsules An imaging sheet roll has a spool on which is wound a film coated with photosensitive microcapsules to form a roll of film between flanges extending radially at the opposite ends of the spool and provide with annular step portions, and a leader tape of a ... | 01/22/1991 |
| 4908641 | Photographic film and film cassette A film cassette is disclosed wherein a filmstrip beginning with a relatively short non-protruding leader portion can be advanced automatically to the exterior of the cassette responsive to rotation of a film spool in a film unwinding direction. The filmst... | 03/13/1990 |
| 4860037 | Film cassette with magnetic film leader A film cassette contains a film spool which is rotatable in an unwinding direction to propel a filmstrip including an integral film leader out of the cassette and is rotatable in a winding direction to wind the filmstrip including its film leader back int... | 08/22/1989 |
| 4739357 | Multi-pitch film leader card A film leader card has a series of holes for receiving the projections on a succession of endless timing belts in a film processor to advance the card and an attached filmstrip through the processor. A middle-most hole in the series of holes is spaced rel... | 04/19/1988 |
| 4674702 | Cassette system having quick connect feature Film (13) in a film cassette (15) is connected to a take-up reel (19) in a film transport mechanism (11) by means of mating connectors (20,30) attached to leaders (27,29) on the cassette film (13) and on the take-up reel (19). The connectors (20,30) are r... | 06/23/1987 |
| 4572460 | Means for pulling tape from a reel The present arrangement includes a first tape leader which can be readily and automatically coupled to a second tape leader. In a preferred embodiment the first tape leader is connected to be wound on a take up reel while the second tape leader is connect... | 02/25/1986 |
| 4545517 | Continuous forms leader A forms leader is disclosed for use in printing of business forms by a printing device. The leader includes a rectangular sheet of flexible material having a series of line holes formed along the edges of the sheet. The sheet is folded along a crease to d... | 10/08/1985 |
| 4478908 | Magnetic recording medium A magnetic recording medium comprising a support having coated thereon a magnetic layer and a leader tape connected to at least one end of the support and the magnetic layer, the leader tape comprising a support having coated thereon a cleaning layer cont... | 10/23/1984 |
| 4467983 | Unreeling device and tape reader incorporating such an unreeling device Device permitting the winding and unwinding of a tape. It comprises a feed reel on which is wound a tape, and a take-up reel equipped with a tape driving strap. The leader of the tape and the free end of the strap are provided with mutual coupling means a... | 08/28/1984 |
| 4455076 | Film supply cassette for camera processor A film supply cassette comprising a hub, axially spaced end flanges, a trailer secured to the hub having an opening to cooperate with a sensor, a length of light-sensitive film convolutely wound about said trailer, and a leader comprising a vapor coated p... | 06/19/1984 |
| 4446205 | Magnetic recording tape having a leader tape A leader tape for use in connection with a magnetic recording tape is disclosed. The leader tape is connected to one or both ends of a magnetic recording tape in order to clean components of the recorder such as the head of the recorder in which the tape ... | 05/01/1984 |
| 4397911 | Cleaning tape Cleaning tape having a cleaning layer formed on one or both sides of a base is disclosed. Said cleaning layer is composed of (1) a binder, (2) an organic polymer powder whose particle size is 3μ or more, and (3) an inorganic solid powder whose particle s... | 08/09/1983 |
| 4295713 | Film and photographic apparatus A film magazine contains a roll of film having an image portion and a leader. The filmstrip is perforated at predetermined intervals with larger perforations in the image portion than in the leader. A camera mechanism is disclosed which uses the perforati... | 10/20/1981 |
| 4276371 | Roll fastener for photographic film New means are providedfor securing the free end of a roll of photographic film against unwinding. The means comprises a strip of flexible plastic which clings to the photographic film, at the free end of the roll and also on the body of the roll adjacent ... | 06/30/1981 |
| 4146031 | Leader or trailer for a magnetic tape This invention relates to a leader or trailer for a magnetic tape, which comprises a plastic support member, a coated layer consisting essentially of a pigment and binder on the surface of the plastic support and a lubricant layer on the back side of the ... | 03/27/1979 |
| 4134526 | Film strip joint for continuous projection A joint for the ends of an elongated perforated film strip which is movable alongside an annularly closed guide path by a conveying means, wherein on the one end of the film strip corresponding in length substantially to that of said guide path a follower... | 01/16/1979 |
| 4110774 | Film guide for film processing equipment An elongated flexible leader for inserting into a film processor and guiding a roll of undeveloped film therethrough. The leader is attached to the film by inserting a tongue which is part of the leader through an aperture in one end of the film.... | 08/29/1978 |
| 4091168 | Leader for magnetic recording tape having coextensive flexible layers with metal laminated therebetween A tape leader, for example, for magnetic recording tape, is comprised of an electrically conductive metal film of aluminum, copper or the like, which is bonded or laminated between two flexible synthetic resin films, for example, of polyester resin, so as... | 05/23/1978 |
| 4072280 | Tape and/or film handling mechanism A tape storage unit comprises a single reel having flanges between which tape is stored and protected by a strippable leader strip wound about the tape and snapped into grooves in the flanges. A tape transport compatible with the reel includes a second re... | 02/07/1978 |
| 4042189 | Tape leader characterized by differential bending stiffness A leader strip is connected with a tape at one end of the tape; and the leader strip has characteristic lengthwise unit bending stiffness which is substantially greater than leader characteristic widthwise unit bending stiffness. Further, the overall widt... | 08/16/1977 |
| 4038453 | Leader strip for motion picture film Leader strip for motion picture films is described which is composed of a substrate of cellulose acetate or polyester, a gum-removing layer comprising an organic binder selected from the group consisting of cellulose esters, polyurethanes, polyacrylonitri... | 07/26/1977 |
| 4033682 | Exposure quantity control circuit An electric shutter is opened and closed to effect an exposure in dependence upon the energization of an electromagnet. A switching circuit controls the energization of the electromagnet in accordance with various exposure information, such as diaphragm s... | 07/05/1977 |
| 3980254 | Film strip leader alignment aid The disclosure relates to an improved means for assuring the proper alignment of the leader on the end of a film strip for a roll of film disposed in a cartridge, whereby, when the cartridge is placed in a viewing or reproducing machine, the end of the st... | 09/14/1976 |