Famous Patents
William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7068000 | Torque control device for electrical tools A torque control device for an electrical tool has a switching circuit, a voltage detecting circuit, a torque detecting circuit and a processor. The switching circuit connects between a motor of the electrical tool and a DC voltage source. The voltage detecting circ... | 06/27/2006 |
| 7011165 | Rotating electric hand tool implement with safety routine An electric hand tool apparatus (1) for driving a drill-like tool, which carries out an at least partial rotational movement, has within a housing (2), an electric motor (4) without or free of collector and slip ring, the rpm of which can be con... | 03/14/2006 |
| 5151844 | Handbrake operated control means for controlling vehicle accelerator pedal A hand brake operated control device of a car includes an electrical control circuit having a normal-open switch positioned under a rear cam portion of a hand brake lever, a normal-close switch formed in a front portion of the hand brake lever to be opera... | 09/29/1992 |
| 4935643 | Device for the limitation of torque in a hair treatment device In a hair treatment device with a winding mandrel driven by a motor and used to wind up hair, the current used by the motor is led through a current limiter circuit in order to limit torque. The current limiter circuit comprises an operating stage and a s... | 06/19/1990 |
| 4808976 | Torque indicator A torsion member (12) has opposing protruding end elements (4, 6) configured for transmitting torque therebetween. A first contact mechanism (20, 26) is mounted to a surface (10) of one end (4) of the torsion member (12). The first contact mechanism inclu... | 02/28/1989 |
| 4591944 | Electronic circuit for tactile sensors An electronic circuit adapted to receive conditioned force signals from a three-axes load cell mounted on the arm of a robot and provide a stop signal for use by a controller of the robot. The circuit compares the sum of the absolute value of the forces w... | 05/27/1986 |
| 4426588 | Weighting circuit for an electrical torque signal in a drilling machine A weighting circuit operates to process a torque signal which may be produced by a strain gauge located within the handle of a drilling machine. The circuit includes a first sensor device for receiving the torque signal, and an integrator which integrates... | 01/17/1984 |
| 4114078 | Mechanical torque limit for valve actuator An electrically energized actuator for operating a valve has an output shaft for connection to a rotatable valve stem and is driven, via a gear train, by an electrically energized motor. A safety shut off mechanism is responsive to a predetermined resista... | 09/12/1978 |
