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 |
| 6814808 | Carrier for semiconductor wafers A quartz carrier having spaced, parallel grooved rods for holding a batch of semi-conductor wafers edgewise in upstanding, spaced, parallel relation is formed with a pair of flat end plates supporting the ends of the rods. The ends of the end plates extend laterally... | 11/09/2004 |
| D494494 | Finger ring having articulated image-bearing flap | 08/17/2004 |
| 6689081 | Rigid ankle and foot orthosis A therapeutic ankle and foot orthosis or brace includes a lower shell and an upper lateral shell which are movably coupled together by a pivot so that the shells accommodate the contour, size and shape of the user's foot and ankle. Cushions are included o... | 02/10/2004 |
| 6666403 | Force-producing apparatus A force-generating device employing a flared body and a surrounding shroud to define a duct of axially diminishing flow area defining a nozzle for accelerating and directing the discharge of a fluid at a cambered vane, a pressure dam depends from the bott... | 12/23/2003 |
| 6604256 | Grout float assembly A grout float, including a blade and a pair of core sections defining a handle. Interlocking male tapered bosses and female tapered receptacles join the core sections. Tapered tongues on the core sections pass through openings in upstanding flanges on the... | 08/12/2003 |
| 6224653 | Electrostatic method and means for removing contaminants from gases An electrical apparatus includes a reaction chamber. A stream of contaminated gasses flows through the chamber. An elongated coronating electrode is positioned in the reaction chamber for producing a corona discharge within the chamber. A multi-stage Fitc... | 05/01/2001 |
| 6065429 | Disposable cat litter box waste receptacle assembly with enclosure An improved disposable, cat litter box waste receptacle assembly with enclosure having a box tray (10) which in its use configuration accepts and holds a litter latrine (14). A latrine privacy enclosure cover (12) that has a cut out removable entry (16) i... | 05/23/2000 |
| 5871192 | Wall-mounted bracket for storing and displaying model airplanes A device for storing and displaying a model airplane. A vertical member adapted for easy attachment to a wall has an outwardly extending tongue at its lower end for retaining and supporting the model on its nose. A pair of wing retaining brackets are rota... | 02/16/1999 |
| 5771619 | Surface-mounted display device The opposed side walls and connecting end walls of this surface-mounted holder can be configured in virtually any desired shape to define a window conforming to a resiliently flexible sheet bearing a display. Inserted into the holder through an opening in... | 06/30/1998 |
| 5611519 | Fastener removing tool A pliers-like hand tool for removing headed plastic fasteners having a stem releasably anchored below a surface incorporates a pair of pivotably joined, wedge-shaped jaws and their associated handles. A spring positioned between the handles maintains the ... | 03/18/1997 |
| 5601633 | High voltage electrical method for removing ecologically noxious substances from gases Electrical method for removing ecologically noxious substances from gases which includes an electrical precipitator having a reaction chamber through which a stream of the gases to be cleaned passes, and which includes an elongated electrode extending int... | 02/11/1997 |
| 5577687 | Portable helicopter landing pad A portable helicopter landing pad especially suitable for deployment on an unprepared surface comprises a number of perforated metal mats which on being joined at their edges define a heliport of predetermined size and shape. Dual-purpose connectors relea... | 11/26/1996 |
| 5566734 | Pleated window shade A pleated construction for roll-up and pull-up window shades, and a pleated material for use as the window covering in such shades. The material comprises a facing layer of horizontally closely-pleated fabric that is tightly, adhesively bonded or fused to... | 10/22/1996 |
| 5542967 | High voltage electrical apparatus for removing ecologically noxious substances from gases Electrical apparatus for removing ecologically noxious substances from gases which includes an electrical precipitator having a reaction chamber through which a stream of the gases to be cleaned passes, and which includes an elongated electrode extending ... | 08/06/1996 |
| 5479675 | Hand trowel assembly An elongated dovetail tongue on the top surface of the trowel blade slips endwise into a closely conforming groove formed in the base of the removable handle until its end abuts a shoulder at the end of the groove. The tongue is longer than the groove, an... | 01/02/1996 |
| 5372507 | Machine-aided tutorial method A method for teaching the practical application of a subject. The student is furnished an introductory body of information encompassing the subject and presented with a simulated life-like situation having a stated goal. Attaining the goal requires the co... | 12/13/1994 |
| 5301964 | Wheelchair This wheelchair incorporates a unitary supporting frame for the drive wheels and swivalable casters, and an adjustable seating assembly. The supporting frame is adjustable to change the wheelbase, track, and frame pitch and thereby shift the user's center... | 04/12/1994 |
| 5279226 | Safe-arm initiator A pair of explosive detonators are recessed in the end of a cylindrical body containing a permanent magnet, which serves as the rotor in a brushless, bi-directional torque motor enclosed in a housing. A reversible positioning current causes the motor to r... | 01/18/1994 |
| 5274860 | Water conserving shower assembly A water conserving shower assembly utilizes a novel distributor connected to a domestic water line carrying hot and cold water combined in a predetermined ratio. A piping system carries water from the distributor and terminates in a shower head. The pipin... | 01/04/1994 |
| 5155992 | Method and means for generating a force A method and means for generating a force. A flared body is enclosed in a shroud to form one or more ducts of axially diminishing cross-section for accelerating and directing the discharge of a fluid introduced into the ducts under pressure. A cambered va... | 10/20/1992 |
| 5108012 | Dispenser for elongated foodstuffs, particularly pasta A device for dispensing predetermined quantities of, for example, spaghetti, includes a hopper containing a supply of the pasta. An outlet in the hopper deposits the spaghetti at the upper end of a vibrating slide. The vibration causes the spaghetti to mo... | 04/28/1992 |
| 5099762 | Electrostatic discharge immune electric initiator An electro-explosive initiator which may be either a coaxial or floating case type, for example, and which is constructed to be immune from the effects of electrostatic discharges. The initiator includes a bridgewire and contact pins for carrying an elect... | 03/31/1992 |
| 5070774 | Machine for the rapid and automatic cooking of foodstuffs, particularly pasta A monolithic upper section contains a boiler surrounding an initial cooking chamber. A lower section contains a final cooking chamber aligned vertically with the upper chamber. Superheated water is piped from the boiler into the upper chamber. Valve contr... | 12/10/1991 |
| 5064062 | Camera-supporting carrying case A camera case comprising two mating shells. A swivelable mounting device on the first shell allows a camera to be mounted to that shell for taking photographs. In their mated relationship, the shells fully enclose the camera. The shells are connected by a... | 11/12/1991 |
| 5058621 | Tank breather In this invention, a breather device for a tank comprises a closed reservoir above the container but having a conduit which depends into the container and has an opening which determines liquid level in the container. The container comprises air inlet mea... | 10/22/1991 |
| 5021794 | Personal emergency locator system The radio transmitter in a miniaturized transceiver concealed on a person to be located, such as a lost child, is activated and transmits a coded UHF radio homing signal upon receipt of an initiating signal containing the child's address code. The initiat... | 06/04/1991 |
| 4976974 | Grape juice concentrate and drink In this invention, both a grape juice concentrate and a grape juice drink are produced by first preparing the raw material for a year's production during vintage, transferring grape juice so produced to a vacuum concentrating column before it ferments, he... | 12/11/1990 |
| 4829166 | Computerized data-bearing card and reader/writer therefor A computerized data-bearing card which includes an internal microcomputer chip which includes a random access memory, a read-only memory and a programmable read-only memory, and which is constructed so that digitized data may be read from and written into... | 05/09/1989 |
| 4699277 | Compression system for microfiche files and the like A system for controllably compressing a plurality of microfiche in a file tray comprises a flat compressor having a rigid upper transverse portion and a flexible, resilient lower transverse portion. A mounting mechanism mounts the compressor to a pair of ... | 10/13/1987 |
| 4690554 | Fingerprint identification device A device employing the optical autocorrelation method for automatically comparing the fingerprint of an individual with a previously identified exemplar utilizes a pair of multifaceted mirrors rotating about mutually perpendicular axes to sweep an image o... | 09/01/1987 |
| 4660448 | Sound reducing means The sound produced by the movement of the teeth of an idling circular saw or band saw blade in air is substantially reduced by exposing the blade to a radiation impedance which is effectively imaginary, thereby subjecting a preselected portion of such sou... | 04/28/1987 |
| 4645228 | Coupler for assembling segmented skis A pair of plates each having an internally threaded boss in its base and upturned flanges along its sides are fixed to the upper surface of adjacent segments of a segmented ski. A pair of lips formed on a rigid slide bracket loosely engage axially aligned... | 02/24/1987 |
| 4645262 | Camp chair that converts to a hand truck The seat of this camp chair has a downwardly projecting support at its forward end and a pair of wheels at its rear end. A back support having a load-bearing platform extending forwardly of its lower end is pivotably mounted to the seat forwardly of the w... | 02/24/1987 |
| 4620633 | Protective envelope device for packaging fragile articles A unitary protective envelope device for packaging fragile articles has an outer wall and a conformable inner wall. A mass of compressed resilient open-celled cellular material is enclosed in the space between the walls and held in compressed condition un... | 11/04/1986 |
| 4592281 | Arming and firing device An improved arming and firing device especially suited for rocket motors. An explosive donor charge is packed against a bulkhead formed in the body of the device. Shock energy generated by the donor charge and transmitted through the unruptured bulkhead s... | 06/03/1986 |
| 4472890 | Shoe incorporating shock absorbing partially liquid-filled cushions A pair of thin-walled hollow partially liquid-filled cushions are enclosed in cavities formed in the sole of a shoe. The first cushion is positioned to coincide with the plantar pads on the lower sides of the wearer's metatarsals; the second to coincide w... | 09/25/1984 |
| 4461287 | Portable exercise and traction apparatus A horizontal padded body-supporting bar is rigidly mounted to a pair of spaced, parallel, upright floor-standing stanchions and supports the weight of the user's body with the head, torso and upper limbs hanging inverted on one side of the bar and the leg... | 07/24/1984 |
| 4458912 | Coupling device for assembling two piece skis A multi-portion ski fitted together with numerous shaped two-part metal coupling devices one part, usually forward, has two or more threaded metal ferrels protruding upward into which metal screws are fastened. The bottom plate on the connection portion s... | 07/10/1984 |
| 4342157 | Shock absorbing partially liquid-filled cushion for shoes A thin-walled hollow partially liquid-filled cushion is permanently enclosed in a cavity formed in the sole of a shoe. Preferably, the cushion is produced by vacuum-forming a pan, having a continuous circumferential lip, from a sheet of durable, flexible,... | 08/03/1982 |
| 4338980 | Device for filling medicament injectors Either a pyrotechnic-powered needleless injector or (with spacer adapters) a conventional syringe is held in firmly abutting alignment with a dispensing orifice of a special storage vial. A flexible perforated seal forms a plug in the dispensing orifice, ... | 07/13/1982 |