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 |
| 6917169 | Driving circuit for rotating motor in forward and reverse direction A field effect transistor is provided between the ground and an H bridge circuit for rotating a motor in forward and reverse directions in a manner that the drain of the transistor is grounded and the gate thereof is coupled to a DC power source such as a battery se... | 07/12/2005 |
| 6262506 | Stator for a rotating electrical machine having multiple control windings A rotating electric machine is provided which includes multiple independent control windings for compensating for rotor imbalances and for levitating/centering the rotor. The multiple independent control windings are placed at different axial locations al... | 07/17/2001 |
| 4357567 | Reversible motor A reversible linear motor has a coil arrangement arranged alongside a conductive body such as a rotatable aluminium disc. The coil arrangement is made up of three separate coils: namely an inner coil and two interconnected outer coils on opposite sides of... | 11/02/1982 |
| 4282464 | Reversible drive circuit for brushless DC motor A brushless DC motor includes a rotor adapted to rotate about an axis and having a plurality of magnets for generating a magnetic flux; a stator having at least two coils through which an alternating signal is applied for rotating the rotor about its axis... | 08/04/1981 |
