Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7311161 | Hospital bed having a drive wheel unit A hospital bed includes a carrier frame, a driven wheel unit disposed below the frame, a motor unit, a drive wheel unit disposed below the frame and coupled operably to the motor unit in such a manner that actuation of the motor unit results in rotation of the drive... | 12/25/2007 |
| 7100725 | Robotic cart pulling vehicle A robotic cart pulling vehicle includes a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system. The positioning error reducing system including at least one of a low load transfer point of the cart attaching mecha... | 09/05/2006 |
| 7018157 | Powered transport apparatus for a bed A patient support and powered transport apparatus are provided. The powered transport apparatus is provided to assist a caregiver in moving the patient support from one location in a care facility to another. ... | 03/28/2006 |
| 7004269 | Driving apparatus for a robot cleaner Disclosed is a driving apparatus for a robot cleaner enabling drive wheels to be in contact with a floor all the time. The driving apparatus for a robot cleaner includes a robot cleaner main body, driving motors mounted in the robot cleaner main body, and for transf... | 02/28/2006 |
| 6966725 | Apparatus for spreading aggregate material on a road berm An apparatus is provided for spreading aggregate material on ground. The apparatus includes a body 12, an engine 14 carried by the body, motive structure 18 powered by the engine to move the apparatus along the ground. A hopper 20 is asso... | 11/22/2005 |
| 5868600 | Toy car A toy car has a body with front and rear wheels, wheel support members with rightward/leftward travel wheels, and an elevating mechanism for lifting up and down the wheel support members in order to set the rightward/leftward travel wheels with respect to... | 02/09/1999 |
| 5535843 | Traveling carriage A traveling carriage includes driven wheels for running on a running surface. For changing a running direction of the traveling carriage, the driven wheels are raised and separated from the running surface by an elevator mechanism and then turned to chang... | 07/16/1996 |
| 4211299 | Parking apparatus for laterally shifting a vehicle A parking apparatus is used for enabling the driver to move the rear end of a vehicle laterally out of a row of vehicles into a parking spot. For this purpose the vehicle is equipped with a lifting mechanism on auxiliary wheels so arranged that the rear e... | 07/08/1980 |
