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 |
| 8137221 | Racket frame A racket frame 10 of the present invention includes fiber reinforced resinous layers. At least one of the fiber reinforced resinous layers is a layer (L1) in which a rubber component is blended. A matrix of the layer (L1) contains a rubber compo... | 03/20/2012 |
| 8079924 | Sports racquet with multi-section frame A sports racquet frame is formed from a plurality of frame sections, some sections formed of a single tubular member and other sections formed of double tubular members. The double tube sections preferably contain string port holes. Also, different frame sections ca... | 12/20/2011 |
| 7503860 | Sports racquet with multi-section frame A sports racquet frame is formed from a plurality of frame sections, some sections formed of a single tubular member and other sections formed of double tubular members. The double tube sections preferably contain string port holes. Also, different frame sections ca... | 03/17/2009 |
| 7309303 | Exercising and physiotherapy system An exercising system has a frame defining a space in which a user is positioned for performing a large number of different exercises. Frame members have holes within which flexible bars are positioned, spanning across the machine, for low-impact exercising using the... | 12/18/2007 |
| 7297080 | Game racquet with separate head and handle portions for reducing vibration A game racquet includes head portion and a handle portion. The head and handle portions include one or both of a fiber-reinforced thermoset material and a fiber-reinforced thermoplastic material. The handle portion is coupled to the head portion by shock and/or vibr... | 11/20/2007 |
| 7285062 | Racquet having cantilevered hoop portions A sports racquet including a frame, a string bed, and at least one cantilevered member. The frame includes a head portion coupled to a handle portion. The head portion includes a distal region, first and second side regions, and a proximal region. A string bed is fo... | 10/23/2007 |
| 7273430 | Tennis racket frame A tennis racket frame is composed of a laminate of prepregs each containing carbon fibers serving as a reinforcing fiber thereof. At least one part of layers of the laminate is formed as a hard layer consisting of a prepreg composed of the reinforcing carbon fibers ... | 09/25/2007 |
| 7258634 | Reinforced lacrosse head A reinforced lacrosse head having improved strength includes a pair of opposing sidewall portions each having a top end and a bottom end, a scoop portion extending between the sidewall portions, a base portion extending between the bottom ends of the sidewall portio... | 08/21/2007 |
| 7137912 | Tennis racket In a tennis racket having a racket frame composed of a fiber reinforced resin, the moment of inertia Ic of the tennis racket in a center direction thereof is set to not less than 13000 g·cm2 nor more than 17000 g·cm2, the moment of inertia Ig... | 11/21/2006 |
| 7131920 | Racket frame A racket frame including a first laminate composed of a plurality of first prepregs consisting of fiber reinforced resin and a second prepreg, consisting of fiber reinforced resin, which is layered on the first laminate. The first laminate has a loss factor (=tan δ... | 11/07/2006 |
| 7097576 | String bearing assemblies for sports racquets A bearing assembly is at least partly disposed within the hollow stem or handle of a sports racquet. A plurality of curvilinear channels are disposed at different lateral locations in a direction which is at a substantial angle to the longitudinal axis of the racque... | 08/29/2006 |
| 7081056 | Sports racket having a uniform string structure A sports racket, for tennis and the like sports, has an elongated handle attached to a head having a racket face, which is spanned by a uniform string structure. The head has four sides, forming a non-elliptical shape, in which the opposite sides are substantially p... | 07/25/2006 |
| 7077768 | Composite racquet with double tube head frame A sports racquet frame is built of a composite of laminations of fibrous material as impregnated by a thermosetting resin. The head section of the frame has an upper tube preferably disposed above the string bed plane and a lower tube preferably disposed below the s... | 07/18/2006 |
| 7077767 | Racket for ball games and production process The present invention relates to a racket for ball games, in particular a tennis racket, squash racket, badminton racket, racquet ball racket or paddle tennis racket comprising a frame consisting of a racket head and a handle portion connected thereto and being form... | 07/18/2006 |
| 7074142 | Racket frame A tennis racket frame (10), including a sleeve composed of a fiber reinforced resin, having a weight not less than 180 g nor more than 270 g, when strings are not mounted in a ball-hitting face thereof surrounded with a head part thereof. Supposing that the s... | 07/11/2006 |
| 7059981 | Racket frame A racket frame (10) including a laminate having not less than two fiber reinforced resinous layers layered one upon another and one or more modified fiber reinforced resinous layers (20) each containing a modified resinous composition, as a matrix resi... | 06/13/2006 |
| 6966855 | Racket with capability of vibration absorption A racket includes a frame having a rim and a connection portion at an end of the rim, a handle fixed at a distal end of the connection portion, an elastic member attached on a predetermined portion of the frame, and a cover layer wrapped around the frame and the ela... | 11/22/2005 |
| 6955784 | Hollow composite products and method for making same The invention concerns a hollow composite product comprising over 20% glass in the form of long fibres, the thickness of the product walls further ranging between 1 and 10 mm about. The invention also concerns a method for making said product, which consists in inse... | 10/18/2005 |
| 6688997 | Racket with reduced yoke rigidity A racket frame (1) has a pipe-shaped racket-frame body (2) made of a fiber reinforced resin and composed of a head (3), a throat part (4), a shaft part (5), and a grip part (6) sequentially arranged and a yoke (10) connected to the racket-frame body (2). ... | 02/10/2004 |
| 6663514 | Racket with vibration damping yoke A frame body (2) is formed separately from a yoke (10) connecting right and left parts of the frame body (2) to each other. The yoke (10) and the frame body (2) are connected to each other by a mechanical connection means, with both ends of the yoke (10) ... | 12/16/2003 |
| 6663515 | Racket with a head and a handle both made of different materials A racket is composed of multiple sections of tubes made of different material with resilient material bonded between the tubes at the joints to attenuate vibration and shock and thus make striking a ball more comfortable for a player.... | 12/16/2003 |
| 6638187 | Racket frame without the need of drilling holes An improved racket frame without the need of drilling holes comprises two compound material pipe bodies. A plurality of U-shaped embedded tubes are uniformly clamped between the two pipe bodies with two openings of each of the U-shaped embedded tubes faci... | 10/28/2003 |
| 6592475 | Sports racket having a tubular frame with reinforcing element A sports racket frame including a main body which has an intermediate portion in the vicinity of which is provided at least one reinforcing member which defines, with the intermediate portion, an inner volume therebetween which extends about an outer peri... | 07/15/2003 |
| 6589125 | Compound material frame body without the need of drilling holes The present invention provides a compound material frame body without the need of drilling holes. A plurality of symmetric embedded tubes are clamped between two compound material pipe bodies. An outmost compound material layer sheathes the compound mater... | 07/08/2003 |
| 6440016 | Racket of a metal tube combined with fiber material A racket of a metal tube combined with fiber material includes a metal frame having a hollow interior and two free ends with sloped end surfaces respectively inserted in with an air-filling tube wrapped around with a carbon fiber layer of a preset thickne... | 08/27/2002 |
| 6319159 | Game racket frame with wooden cover layer A game racket frame is formed of a main body and a wooden layer. The main body is formed of an annular head with string holes, a handle, and a neck connecting the head and the handle. The head and the neck are made of a plurality of fabric boards which ar... | 11/20/2001 |
| 6302812 | Hybrid composite racket frame A games racket frame comprising a main frame (1) in the form of a hollow tubular structure made of a fibre reinforced composite including a thermosetting material, and at least one additional component (2, 3 or 4) including a thermoplastic material and in... | 10/16/2001 |
| 6234921 | Sports racquets with tripod weighting A sports racquet has a lightweight frame and a pair of pods, having an increased cross-sectional width, at the 11 o'clock and 1 o'clock positions of the head. The pods also preferably have an increased wall thickness, or a molded-in weight element, so as ... | 05/22/2001 |
| 6071203 | Two piece sports racquet A composite sports racquet includes a head portion which is formed by an upper frame half and a lower frame half. Each frame half is a tubular frame section, and includes a generally flat wall. The two walls are bonded to one another to form a unitary hea... | 06/06/2000 |
| 6012996 | Game racket frame made of fiber reinforced plastic A game racket frame of fiber reinforced plastic consists of a head formed of an oval main body which is composed of a first inner tube, a second inner tube, and an outer tube. The inner tubes are arranged side by side in the direction toward the head face... | 01/11/2000 |
| 5935028 | Badminton racket A badminton racket is composed of an oval frame, a grip, and a shaft fastened between the oval frame and the grip. The shaft has a shell which is formed of a plurality of fiber-reinforced plastic layers and at least one metal gauze layer. The metal gauze ... | 08/10/1999 |
| 5922255 | Method of manufacturing a racket frame and throat A racket frame and throat unit is prepared by injection molding using a mold with a mold cavity defining the oval frame and the throat. The method includes first injecting a first quantity of a fiber-reinforced thermoplastic resin into a first injection p... | 07/13/1999 |
| 5897447 | FRP racket and method for producing the same A FRP racket having a frame includes fibre reinforced plastic containing resin and reinforcing fibre and which is composed of a top portion which forms the string face, a grip region and a throat portion. This frame contains at least one helically wound l... | 04/27/1999 |
| 5700210 | Racket frame and process for producing the same A racket frame, which has a frame main body 12 made of a fiber reinforced plastic, an ionomer film 13 covering the frame main body 12, and a coating film 15 formed over the ionomer film 13, is provided with a gas permeable porous material film 14 interpos... | 12/23/1997 |
| 5551689 | String suspension and frame construction for sports rackets A sports racket which is made by joining longitudinal sections of a racket, particularly half sections of a racket, along a plane parallel to the center plane through the playing surface of the racket. The longitudinal sections of the racket define recess... | 09/03/1996 |
| 5516100 | FRP racket frame and a method for producing the same In production of a tennis or badminton racket frame in a mould under application of heat with pressure, an impervious tube is inserted into an FRP tubular material, a pair of such tubular materials are arranged in a spaced juxtaposition in the mould, a st... | 05/14/1996 |
| 5507486 | Tennis racket frame A tennis racket frame, made of fiber-reinforced resin, in which the volume percentage of aromatic polyamide fiber and/or all-aromatic polyester fiber of all fiber-reinforcing materials of a throat section, a flake section, and a handle section is 40 or mo... | 04/16/1996 |
| 5487806 | Method for embodying a flexible tubular element impregnated with resin to be subsequently moulded According to this method windings of reinforcing fibers are impregnated with resin and are wound, along a given length, around a flexible sheath placed onto a rigid rotary-driven mandrel. At least one additional winding of said impregnated reinforcing fib... | 01/30/1996 |
| 5482774 | Composite prepeg and tennis rackets using the same A composite prepreg for producing a tennis racket, which is light and tough and superior in flexibility and vibration absorption abilities, comprises thermosetting resin and reinforcing fibers, wherein the reinforcing fibers are a combination of (a) aroma... | 01/09/1996 |
| 5419554 | Sports racket frame A sports racket frame including a head portion and a handle portion formed from unidirectional high strength fibers impregnated with thermoplastic resin in the form of a sheet containing a plurality of adjacent strips in which the unidirection of the fibe... | 05/30/1995 |
