Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 6254499 | Double stringed tennis racquet with grommet insert A tennis racquet with a holeless oval frame head with front and back faces provided with a continuous outside groove and with spaced-apart recessed transverse cuts in each face occupied by a portion of a continuous string. The edge groove is interconnecte... | 07/03/2001 |
| 5743822 | Double stringed tennis racquet A tennis racquet for employment during the game of tennis by enhancing a player's ability to produce spin and drop shots which includes a holeless oval frame head having front and back faces provided with spaced-apart grooves and having a continuous side ... | 04/28/1998 |
| 5443575 | Racquet stringing A method of stringing a tennis racquet with dual taper strings so as to dispose the smallest diameter strings at the approximate center of the string bed defined by the strings, with the diameter of the string's increasing from such center to the peripher... | 08/22/1995 |
| 5423532 | Double-strung game racquet and method for stringing A double-strung game racquet includes a headframe with two parallel playing surfaces, each forming an area at least as large as an area bounded by an external perimeter of the headframe. The playing surfaces are formed using two strings, a horizontal tens... | 06/13/1995 |
| 5322279 | Double strung tennis racquet A tennis racquet has a frame which includes a frame head portion with an outwardly facing stringing groove and an inwardly facing surface which is generally convex. The stringing groove includes a pair of angled side wall surfaces. A series of stringing h... | 06/21/1994 |
| 4804183 | Double faced sports racquet A sports racquet having two string faces each with a different tension to provide variable playing characteristics. The racquet is further equipped with two different grip surfaces to assist the player in detecting which racquet face is in use and with a ... | 02/14/1989 |
| 4320900 | Rackets This invention relates to a games racket, such as a tennis racket which is "double-strung", i.e. the stringing is disposed in two generally parallel planes located on opposite sides of the head frame. The head frame has a generally radially outwardly open... | 03/23/1982 |
| 4293129 | Game rackets and paddles with nonparallel playing surfaces This relates to game rackets, such as tennis rackets, and to paddles, such as table tennis paddles, with two discrete playing surfaces wherein the planes of the playing surfaces intersect each other generally at the crown portion of the racket head or pad... | 10/06/1981 |
| 4213608 | Game racquets A radical new game racquet consisting of a frame and ball contacting facing surfaces which can move with respect to the frame. The facing is capable of having a nonnegligible velocity in a plane tangent to the facing at a given point. The facing motion is... | 07/22/1980 |
| 4204680 | Rackets This invention relates to a games racket, such as a tennis racket which is "double-strung", i.e. the stringing is disposed in two generally parallel planes located on opposite sides of the head frame. The head frame has a cross-sectional profile generally... | 05/27/1980 |
| 4190249 | Tennis racket and method of making same Tennis rackets and the like which are particularly adapted for transferring angular momentum to a ball, and methods for making such rackets. The rackets have a central strata of cross strings of particular arrangement and two outer strata of main strings ... | 02/26/1980 |
| 4049269 | Rackets This invention relates to a games racket, such as a tennis or squash racket, including a handle intended to be held in the hand, and carrying a head having an open marginal frame defining a central opening across which extends tensioned stringing carried ... | 09/20/1977 |
| 3968966 | Racquet with two independently strung faces An elongated band with a T-shaped cross section is bent into the form of an ellipse and is attached to a handle to form a tennis racquet frame of conventional proportions. The stem of the T faces inwardly along the periphery of the ellipse. Conventional r... | 07/13/1976 |
