Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6400896 | Phase change material heat exchanger with heat energy transfer elements extending through the phase change material A heat exchanger for a phase change material including a container holding the phase change material, a tube surrounding the container to define an annular space therebetween, and preferably divider walls within that annular space to create a circuitous p... | 06/04/2002 |
| 5560602 | Pinball machine cabinet assembly A pinball machine cabinet is provided comprising a playfield box and a back box attached thereto. The back box contains electronic driving circuitry and includes a speaker panel attached thereto, the speaker panel being movable between an open position an... | 10/01/1996 |
| 5518236 | Pinball multi-path play feature with magnetic ball diversion A play feature for use in conjunction with a pinball game having an inclined playfield over which a ball may roll is provided. The play feature includes a ball directing member defining an entrance pathway, a first exit pathway, and a second exit pathway.... | 05/21/1996 |
| 5507487 | Wire form for pinball skill loop shot A wire form loop for use in conjunction with a pinball machine having a playfield on which is mounted a plurality of game play features. The playfield includes a shooter lane, play area, and drop area wherein at least one game play feature is located in t... | 04/16/1996 |
| 5501466 | Coin projecting game apparatus A game apparatus is provided comprising a cabinet defining a playing area including a plurality of shelves mounted therein where each of the shelves has disposed thereon a plurality of game pieces. A receiving mechanism is attached to the cabinet for acce... | 03/26/1996 |
| 5497989 | Ball trough for pinball games In a pinball machine a ball trough is provided for moving the ball between the drain hole and the shooter lane. The ball trough comprises a channel fixed to the playfield and has a first end adjacent the drain hole and a second end proximate to the shoote... | 03/12/1996 |
| 5497994 | Pinball movable doors A pinball game using a pinball adapted to be propelled along a playfield is provided. The pinball game includes a target mounted above the playfield and first and second movable objects mounted above the playfield which are movable between a closed positi... | 03/12/1996 |
| 5496030 | Pinball kick back play feature A pinball machine is provided and includes an inclined playfield for supporting a rolling ball. The inclined playfield has associated therewith at least one flipper, an exit lane, and a drain hole. A door mechanism having a retractable door is positioned ... | 03/05/1996 |
| 5494285 | Pinball playfield roller assembly A pinball machine is provided and includes a game cabinet having disposed therein a playfield movable between open, intermediate, and closed positions. A support assembly is used for maintaining the playfield within the cabinet. The support assembly inclu... | 02/27/1996 |
| 5474292 | Pinball game ball diverter mechanism A ball diverter mechanism for use in directing a ball in a pinball game having an entry path and first and second exit paths. The ball diverter mechanism comprises a solenoid having a plunger movable between a first position wherein the plunger is extende... | 12/12/1995 |
| 5452894 | Pinball wand A wand for a pinball game which carries a pinball from one position to another by electromagnetism. The pinball rolls along the bottom surface of the wand as the wand is rotated to move the pinball from one position to another.... | 09/26/1995 |
| 5449172 | Pinball property changing target A target for a pinball game utilizing a pinball rolling on a game surface is provided. The target includes a single pallet having disposed thereon a first display and a second display. A mask is disposed in overlapping relation with the single pallet. A p... | 09/12/1995 |
