Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 6917171 | Control device and method of stopping spindle motor of an optical disc system A control device and a method of stopping the spindle motor or an optical disc system. The control device primarily includes an optical disc control chip, a motor driving circuit and a spindle motor. The optical disc control chip generates and delivers a spindle mot... | 07/12/2005 |
| 5412298 | Motor control circuit having series or compound excitation during starting and shunt excitation during normal running A motor control circuit provides series or compound excitation during starting and shunt excitation during normal running. A switch responsive to the motor speed, the armature current, the armature EMF, or the like, includes terminals connected to the ser... | 05/02/1995 |
| 4413215 | Marine trim and tilt positioning system A reversible motor is coupled to the stern leg of a watercraft for angulating the leg up and down through a trim and tilt range. A manually settable device provides a voltage signal corresponding to the desired trim angle and a position sensor provides a ... | 11/01/1983 |
| 4406979 | Fail-safe system for pulse-controlled three-terminal d.c. motor A pulse control circuit for a d.c. series motor having an armature and two oppositely-wound field windings, comprises a contactor in series with the motor, two main thyristors each connected in series with the armature and a respective one of the field wi... | 09/27/1983 |
| 4386303 | D.C. Motor system for a gatling gun A feature of this invention is the provision of a reversible, D.C. shunt field motor having an armature and two separate field windings, each field winding being capable of producing rated field flux. The motor is capable of bidirectional rotation having ... | 05/31/1983 |
| 4384240 | Regenerative braking system for three-terminal d.c. motor A pulse control circuit for a three-terminal d.c. series motor having an armature and two oppositely-wound field windings comprises a respective main thyristor in series with each field winding, one or other of the main thyristors being operated at a vari... | 05/17/1983 |
| 4371821 | Electromagnetic motor rotatable in either direction An electromagnetic stepping motor has a stator with an armature having the shape of an isosceles trapezoid the base of which is interrupted by a central gap and which is provided with three pole faces. The rotor comprises a permanent magnet. The stator co... | 02/01/1983 |
| 4361790 | Electromagnetic motor rotatable in either direction An electromagnetic stepping motor has a stator with an armature having the shape of an isosceles trapezoid the base of which is interrupted by a central gap and which is provided with three pole faces. The rotor comprises a permanent magnet. The stator co... | 11/30/1982 |
| 4196375 | A.C. tape reel servo A linear servo circuit for A.C. motors is disclosed. The servo circuitry is used in a magnetic tape transport to control the motor which operates a tape reel on which the magnetic tape is stored. The servo circuitry develops two complimentary saw-tooth vo... | 04/01/1980 |
| 4146826 | GTO bi-directional motor control circuit Gate-turn-off silicon controlled rectifiers (GTO's) are selectively rendered conductive to control the direction of rotation of a bi-directional motor. To this end a digital logic network is responsive to either one or both of a pair of remotely located s... | 03/27/1979 |
| 4044286 | Control circuit for hospital bed Beds, such as hospital beds, in which at least some portion of the bed is movably actuated by an electric motor (or motors) are provided with a control circuit to determine proper energization of the motor from an AC power source. Since the AC signal from... | 08/23/1977 |
