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 |
| 7235911 | Stepping motor A stepping motor includes: a magnet; a coil arranged concentrically with the magnet and to be opposed to a magnet, a predetermined clearance being provided between the magnet and the coil; and a magnetic member that surrounds the coil and includes a magnetic pole in... | 06/26/2007 |
| 6823221 | Motion control system and method which includes improved pulse placement for smoother operation A motion control system and method are disclosed which provide improved pulse placement for smoother operation of a motion device such as a stepper motor. A placement of pulses may be determined for each of a plurality of time intervals such that the pulses are plac... | 11/23/2004 |
| 6323617 | Stepping motor drive control circuit A stepping motor preferably applied to an image reading motor for a facsimile device or the like, drives the rotation with low noise by repeating turning-on and turning-off switching of the driving voltage in the stepping motor when a change of the exciti... | 11/27/2001 |
| 5932987 | Variable step rate precision pumping apparatus A method and apparatus for controlling a low volume, low rate precision dispensing pump for photochemicals and the like comprises generating constant current signals having magnitudes related by sin and cos values to the angular step size of the stepper m... | 08/03/1999 |
| 5473227 | Self-synchronous electrical motor A self-synchronous electrical motor comprises one rotor, one stator formed by at least one set of four stator windings, at least one electronic switch connected to a stator winding to control the current in the stator winding and a sensor of the angular p... | 12/05/1995 |
| 5221885 | Low-power dual voltage drive circuit and method A low-power dual voltage drive circuit and method which includes controlling a stepper motor overdriven with a high voltage. The stepper motor drive circuit includes a high voltage supply for overdriving the stepper motor, a low voltage supply, and an ove... | 06/22/1993 |
| 4613962 | Tracking device with linear motor A device for tracking a movable body along a linear path parallel to a plane includes a linear motor for driving the body along the linear path. The body is mounted, as by rollers, for movement along a guide, such as a pair of parallel guide rails, suppor... | 09/23/1986 |
| 4573001 | Coil density modulation A Coil Density Modulation (CDM) for the control of alternating current motors which controls the speed of the rotating magnetic field produced in the armature of the motor controlled. The magnetic flux wave components produced in the phases of the motor a... | 02/25/1986 |
| 4379257 | Dynamo electric machines A single phase or multiphase dynamo electric machine including a stator having at least one winding arranged to be energized to provide an alternating flux, and a further member, e.g. a rotor, movable with respect to the stator and having at least one sho... | 04/05/1983 |
| 4357568 | Variable speed AC dynamo electric machine A single phase or multiphase dynamo electric machine including a stator member having at least one winding arranged to be energized to provide an alternating flux, and a further member, e.g. a rotor, movable with respect to the stator and having at least ... | 11/02/1982 |
| 4004207 | Rotary switch A multiple contact rotary switch comprises a rotatable staff to which an armature is electrically and physically mounted. A plurality of pins is spaced equi-radially away from the staff and around the staff, and the armature is arranged to move past each ... | 01/18/1977 |
| 3986094 | Logic system for print ball tilt control A logic system for controlled energization of predetermined stepper motor phases for various optimal times employing a read only memory having a plurality of memory element arrays corresponding to predetermined stepper motor sequencing commands correspond... | 10/12/1976 |
