The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 4111573 | Triple leg coupler An improved fully mechanized sawmill is provided which is composed of structurally independent modules which are removably mounted on a platform composed of a plurality of side-by-side longerons supported horizontally on files of spaced-apart vertical pie... | 09/05/1978 |
| 4104722 | Method and apparatus for celestial navigation This invention provides an improved method and apparatus for celestial navigation. A reference spherical triangle is established from the coordinates of the ground position of an observed selected celestial body and an assumed position for the observer. A... | 08/01/1978 |
| 4104420 | Photovoltaic cell A large area photovoltaic cell comprising a layer of multicrystalline cadmium sulfide, about 1 to 2 microns thick, formed by simultaneously spraying two suitably selected compounds on a uniformly heated plate of Nesa glass, thereafter forming a coating of... | 08/01/1978 |
| 4103543 | Method and apparatus for determining vehicle fuel consumption A method and apparatus for deriving the fuel consumption ratio of a motor vehicle by delivering a preselected quantity of fuel to operate the motor, measuring the distance the vehicle travels on the fuel supplied and displaying the measured distance in un... | 08/01/1978 |
| 4102460 | Timber stacking assembly A timber stacking assembly having at least one elongated lifting arm, means for moving said lifting arm from a first position to a second position, a stacking foot element associated with said lifting arm adjacent one end thereof, means for pivotally moun... | 07/25/1978 |
| 4102229 | Sawmill log turning apparatus This invention is directed to an improved stop and loader assembly for use in a sawmill and the like, and more particularly includes an improved combination slapper bar and log turner. The combination slapper bar and log turner preferably includes a recta... | 07/25/1978 |
| 4095006 | Cadmium sulfide film A method of forming a cadmium sulfide film from a solution containing a cadmium salt and a sulfur containing compound comprising inclusion of a chlorine containing compound in the solution utilized to form the cadmium sulfide film.... | 06/13/1978 |
| 4094220 | Sawmill method and apparatus This invention is directed to an improved stop and loader assembly for use in a sawmill and the like, and more particularly includes an improved combination slapper bar and log turner. The combination slapper bar and log turner preferably includes a recta... | 06/13/1978 |
| 4086101 | Photovoltaic cells A method of making low cost photovoltaic cells on a large scale basis by means of a continuous process of coating sheet glass while the sheet glass moves in and has its under surface immersed in a tank of molten material, comprising forming the film of Cd... | 04/25/1978 |
| 4085254 | Biological apparatus for generating electrical power and process for producing bacteria electrolyte In one exemplar embodiment, a biological source of electrical power is provided. The electrical power source comprises a pair of electrodes formed of elements having differing electromotive force. Interposed between the electrodes and in contact with them... | 04/18/1978 |
| 4081992 | Apparatus for load testing foundation shafts A reaction tie-down system for axially load testing foundation members is provided by removably interconnecting a plurality of high tensile strength bar members from a base plate within a concrete anchor shaft through an adaptor to load-carrying girders. ... | 04/04/1978 |
| 4077645 | Trailer assembly and connector unit therefore A trailer assembly for a two-wheel vehicle including a compact body portion carried and supported by wheels, an easily attachable and detachable connector assembly for attaching the trailer to the vehicle, and a kick-stand unit for facilitating ease of ha... | 03/07/1978 |
| 4077333 | Adjustable table An adjustable table is provided for use with a hospital bed and which allows a person reclining in the bed to easily change the angle of inclination of the table surface. The planar member is rotatably connected at one end to and extended horizontally out... | 03/07/1978 |
| 4073108 | Method and apparatus for rigidly interconnected ceiling and wall construction In one exemplar embodiment, a construction hanger for rigidly interconnecting ceiling inverted tee support members and a structural wall channel member is provided, the hanger having a generally U-shaped configuration with a body member and extending depe... | 02/14/1978 |
| 4072145 | Brain wave signal sensor headband assembly A headband assembly for sensing signals of brain wave frequencies of human subjects that includes an adjustable headband adapted to fit various sized heads, constructed to be quickly attached and detached by the wearer, and including electrodes that are s... | 02/07/1978 |
| 4071278 | Leaching methods and apparatus In a leaching process to recover a selected element or mineral from a gangue, an AC current is applied to the mixture to accelerate the rate at which chemical reactions occur. If the treated material is located in a subsurface earth formation, the AC curr... | 01/31/1978 |
| 4068638 | Fuel vaporizing method and apparatus Methods and apparatus are provided for increasing the vaporized proportion of a stream of volatile liquid fuel supply to an internal combustion engine. The non-volatilized portions of the fuel discharged from the carburetor are traveled over a plurality o... | 01/17/1978 |
| 4038152 | Process and apparatus for the destructive distillation of waste material An apparatus is provided for the destructive distillation of organic waste materials. An insulated sealed distillator compartment is provided having a plurality of conveyor stages for transporting the waste material through the sealed compartment while su... | 07/26/1977 |
| 4037655 | Method for secondary recovery of oil In one exemplar embodiment, method and apparatus include providing an electrode disposed in a plurality of vertically spaced boreholes penetrating the formation. The plurality of electrodes in contact with the salt water and oil of the formation are conne... | 07/26/1977 |
| 4029273 | Kite An inflatable delta wing kite having a single air chamber formed of a bulbous nose portion and three frusto conical shaped tubular portions forming structural beams, one beam extending along the central longitudinal axis, and the other two forming the lea... | 06/14/1977 |
| 4026504 | Maneuverable, inflatable kite A maneuverable, deltoid-shaped, inflatable kite having, when inflated, a bulbous nose portion, a central air beam, two diverging side air beams and an uninflated airfoil between the central air beams and each side air beam. Three control line anchors, one... | 05/31/1977 |
| 4024498 | Apparatus for dead track recovery In one exemplary embodiment, an improved apparatus for recovery of a dead track in NRZI tape data format having parallel transmission of data bits is provided in which a dead track recoverer circuit is provided for sensing the absence of a necessary data ... | 05/17/1977 |
| 4017842 | Swimming pool alarm system and method with adjustable sensitivity A swimming pool alarm system which is responsive to the height of waves resulting from unauthorized entry, and which includes provision for changing its sensitivity. An alarm circuit is provided with a switch having a plurality of stationary contacts spac... | 04/12/1977 |