Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 4153851 | Magnetic coupling A rotor and base, rotatingly connected, are each provided with a plurality of magnet assemblies. The magnet assemblies on one of the rotor and base are fixed and the magnet assemblies on the other of the rotor and base are moved radially in synchronizatio... | 05/08/1979 |
| 4145165 | Long stroke pump A very high pressure pump apparatus which minimizes wear on the seals thereof and on valves connected thereto, by utilizing a very long stroke piston rod whose opposite ends are received in long cylinders. An electric motor which drives the rod, includes ... | 03/20/1979 |
| 4145625 | Electro-magnetic devices An electro-magnetic device comprises a first annular member and a second member having a cylindrical surface, the two members being interengaged. The presented surfaces of the two members are each provided with a two start or a multiple of a two start, th... | 03/20/1979 |
| 4123691 | Electromagnetic devices An electromagnetic device comprises an annular stator and a movable armature having a cylindrical outer surface, located within the stator, the stator having a thread formation consisting of a pair of helical grooves and the armature having at least two t... | 10/31/1978 |
| 4116591 | Fuel injection pumps A fuel injection pump comprises a housing a pump assembly mounted within the housing and an annular armature slidable within a bore defined in the housing. The armature is connected to a moving part of the pump assembly and located in the annular space be... | 09/26/1978 |
| 4082969 | Magnetic torque converter The magnetic torque converter consists of two basic components, - A large flat disc/wheel containing multiple equally spaced permanent magnets arrayed so that all poles attract at the disc periphery, - and a, Driving helical rotor fitted with similar permanent attr... | 04/04/1978 |
| 4066922 | Electrical motor-control device for electrical equipment Electrical motor-control device for electrical equipment comprising a drive mechanism including an electric motor and a movement transformation mechanism including an endless screw on which is installed a linearly displaceable nut connected with slight pl... | 01/03/1978 |
| 4048531 | Variable reluctance stepper motor A variable reluctance stepper motor includes an energizable first stator cooperative with a first rotor for imparting incremental motion to the rotor and a second stator generating a permanent magnetic field and a second rotor cooperative therewith to res... | 09/13/1977 |
| 4020374 | Superconducting electric motors A linear motor comprises an electrically conductive tubular track consisting of one or more pairs of helically wound strips and a movable assembly. The movable assembly includes a superconducting field winding freely spinning about an axis close to the ax... | 04/26/1977 |
| 4011477 | Apparatus using variations in magnetic force to reciprocate a linear actuator Apparatus for converting the variations in magnetic force between two magnets, one rotating and one non-rotating, into reciprocating linear motion of an associated device, said apparatus including a motor driven rotatable permanent bar magnet and a non-ro... | 03/08/1977 |
| 3987323 | Electric motor with resiliently mounted rotor The motor of an electric window or sunroof operating mechanism for a motorcar has a rotor axially movable on a normally fixed base against the restraint of compression springs. A nut on the tubular motor shaft threadedly engages a cable partly received in... | 10/19/1976 |
| 3967146 | Magnetic motion conversion device A motor utilizing permanent magnets or electromagnets wherein the magnets are arranged with like poles facing one another in a normally repelling position. A magnetic flux field suppressor having a non-magnetic portion and a magnetically permeable portion... | 06/29/1976 |
| 3945076 | Circular toothbrush A circularly movable mechanical toothbrush having a fly wheel type drive shaft loosely joined to a rod near one edge thereof. Actuation of the fly wheel causes the rod to rotate in a distinct motion that causes toothbrush bristles to be maintained at all ... | 03/23/1976 |
