Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7357752 | Power train system having creeper module A power train assembly is driveably engaged with an input source and includes a transmission module having a casing and a drive member. The transmission module is driveably connected to the input source and a creeper module is driveably engaged with the drive member... | 04/15/2008 |
| 7211018 | Differential planetary gear device, and differential planetary gear device starting device and starting method A differential planetary gear apparatus has a single-pinion-type structure in which one planetary gear (3) is arranged in a radial direction and one or more planetary gears (3) are arranged in a circumferential direction in a region between a sun gear ... | 05/01/2007 |
| 7098563 | Drive system having a hollow motor main shaft and a coaxial, manually driven auxiliary shaft A motor main shaft and auxiliary shaft coaxial drive system to provide dual transmission input or output at single end or both ends by having its main shaft made in hollow to receive insertion of an auxiliary shaft coaxially; with separate transmission to link to re... | 08/29/2006 |
| 7026780 | Method for stabilizing the movement of an articulated chain of a chain block, especially to prevent the formation of a resonance oscillation of the chain, and a chain block apparatus The invention concerns a method for stabilizing the motion of an articulated chain of a chain block, especially to prevent the formation of resonance oscillation of the chain, in which an articulated chain is led across a polygonal chain wheel with non-uniform pitch... | 04/11/2006 |
| 6401849 | Driving apparatus for a vehicle First and second dynamo-electrical machines are provided. A first rotor forming the first dynamo-electrical machine together with a second rotor is connected to either one of a front driving shaft and rear driving shaft. A second rotor forming the second ... | 06/11/2002 |
| 6157147 | Power transmission apparatus A power transmission apparatus manipulates the transmission of power of the mechanical and/or electrical form. The power transmission apparatus is constructed integrating together a power-transmitting device and a transmission interaction redistributing m... | 12/05/2000 |
| 5394071 | Control network with on-line iteration and adaptive filter A feedback control system modifies a drive signal to a plant which provides an achieved response signal in response to the drive signal. A first summing element provides a response error signal representing the difference between a desired response signal... | 02/28/1995 |
| 5331266 | Cooperative differential drive system A cooperative differential drive system (20) for use in material handling and flight control and guidance systems, and the like. The drive system (20) may be employed in application that require high resolution task repeatability capabilities and the exec... | 07/19/1994 |
| 5134346 | Apparatus for driving a spindle of an electroerosive machine The driving apparatus for the rotation of the spindle or the work piece pallet of an electroerosive machining device comprises two electric motors which drive e.g. the spindle to a rotational movement by means of two gear boxes and a plurality of gear whe... | 07/28/1992 |
| 5019755 | Electric motor drive system An electric motor drive system having a first electric motor, a first drive shaft to which the first electric motor is coupled, a second electric motor having a higher power rating than the first, a second drive shaft to which the second electric motor is... | 05/28/1991 |
| 4760314 | Rotation controller for a differential actuator A rotation control apparatus for a differential actuator includes two induction motors and a differential mechanism for producing a constant torque on its output shaft based on the differential speed of the induction motors. The appartus includes two inve... | 07/26/1988 |
| 4633148 | Linear drive motor multiple carrier control system Disclosed is a multiple carrier transportation system. The system employs a plurality of linear induction motors positioned along a track. A plurality of carrier units are used for moving work pieces along the track. Each carrier is mounted with a reactio... | 12/30/1986 |
| 4525655 | Two stage electric drive An electric motor drive system having a first direct current electric motor, a first drive shaft to which the first electric motor is coupled, a second direct current electric motor having a higher power rating than the first, a second drive shaft to whic... | 06/25/1985 |
| 4467230 | Alternating current motor speed control An alternating current speed control of the type associated with an alternating current motor whose output speed is essentially constant, the motor speed control being capable of varying the output speed of the motor from two times normal output to zero. ... | 08/21/1984 |
| 4382188 | Dual-range drive configurations for synchronous and induction generators The invention is a dual-range drive system for synchronous and induction generators which may provide primary power for aircraft systems. In a first embodiment, utilization of a toroidal drive (10) in combination with a planetary drive (37) enables variab... | 05/03/1983 |
| 4354144 | Transmissionless drive system A continuously variable transmissionless drive system providing maximum torque at low speeds. The system is usable in a hybrid vehicle having a prime mover, such as an internal combustion engine, operated at its optimum rpm for efficiency. The prime mover... | 10/12/1982 |
| 4242617 | Electric vehicle having dynamic braking and regeneration An electrical vehicle is propelled by a constant speed motor receiving current from a storage battery. An alternator, driven by the vehicle power train through a differential while the vehicle is in motion, is associated with the drive train such that it ... | 12/30/1980 |
| 4193019 | Direct digital control device A digital control device wherein both an input drive, which, in response to signal pulses, produces a specific increment rotation of an output drive, and a feedback drive, which is driven in proportion to the incremental rotation so produced, are connecte... | 03/11/1980 |
