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| Number | Title | Issue Date |
| 7247978 | Acceleration tolerant piezoelectric resonator The invention relates to piezoelectric resonators. An interposer element is used between a resonating plate and the resonator package to provide improved (i.e. reduced) acceleration sensitivity. The interposer element is preferably of similar thermal expansion chara... | 07/24/2007 |
| 7239052 | Magnetic actuators A magnetic actuator. A yoke includes a first opening and a second opening, a frame, and a path. A first magnet is disposed in the first opening in the vicinity of the frame. A second magnet is disposed in the second opening in the vicinity of the frame. A coil compr... | 07/03/2007 |
| 7148590 | Polyphase sawyer motor forcer An improved hybrid variable reluctance linear forcer design of the type known as a Sawyer motor forcer is provided with a 6-phase magnetic design. The 6-phase magnetic design has reduced force ripple compared to existing 2/4-phase and 3-phase designs providing smoot... | 12/12/2006 |
| 7049732 | Electroactive polymers The present invention relates to transducers, their use and fabrication. The transducers convert between mechanical and electrical energy. Some transducers of the present invention include a pre-strained polymer. The pre-strain improves the conversion between electr... | 05/23/2006 |
| 6956453 | Bi-stable magnetic latch A magnetic bi-stable latch with an upper stator and a lower stator, a rotor between the upper stator and lower stator and adapted for rotation between a first latched position and a second latched position. Each of the stators is a magnetic assembly having at least ... | 10/18/2005 |
| 6859120 | Optical switch using risley prisms An optical switch using Risley prisms and rotary microactuators to independently rotate the wedge prisms of each Risley prism pair is disclosed. The optical switch comprises an array of input Risley prism pairs that selectively redirect light beams from a plurality ... | 02/22/2005 |
| 6667678 | Actuator An actuator is constructed so that the rotor is rotated within the range of a preset angle in a direction corresponding to the direction of current supply to the stator coil. The rotor includes a column-shaped permanent magnet having surfaces perpendicula... | 12/23/2003 |
| 5909068 | Vibration generating device A small-size, thin-profile vibration generating device capable of functioning with improved durability and reliability and with less consumption of power includes a yoke constituting an electromagnet on which a coil has been wound, and a movable element h... | 06/01/1999 |
| 5886442 | Magnetic attraction driving engine using permanent magnet A magnetic attraction driving engine utilizing a permanent magnet is provided with a permanent magnet, an electromagnet formed by winding a coil on a magnetic core with one end thereof stuck to one magnetic pole end of the permanent magnet, an excitation ... | 03/23/1999 |
| 4673833 | Electromagnetic vibratory exciter An electromagnetic vibratory exciter for use in vibratory equipment incorporates a free mass housed in an elongate housing having electromagnets mounted inboard at each end of the housing. The free mass is totally enclosed and carries a pair of armatures ... | 06/16/1987 |
| 4534714 | Fluid operating device A fluid operating device including a cylinder assembly with a cylinder bore and a pair of pistons slidably disposed therein. A plurality of electromagnets are mounted on each piston in opposed relation and extend the pistons by magnetic repulsion when ene... | 08/13/1985 |
| 4494023 | Magnetic motor machine A magnetic motor machine is provided in a compact housing and comprises a pair of electromagnetics rigidly attached within said housing in spaced apart relationship. Electronic circuits and power supplies are provided for each of said electromagnetics. Th... | 01/15/1985 |
| 4228373 | Electromagnetic motor A pair of spaced, toroidal-shaped, electromagnetic coils, when supplied with alternating DC current, cause a floating armature to reciprocate therebetween. The armature itself includes a second pair of back to back, toroidal-shaped electromagnetic coils m... | 10/14/1980 |
| 4184088 | Detachable head appliance driven by an electric motor In an apparatus which is driven by an electric motor, for example, a dry-shaving apparatus or the like, which consists of a basic appliance on which a structural unit equipped with a tool can be placed and which comprises an appliance element which perfor... | 01/15/1980 |
| 4179631 | Electromagnetic motor A pair of spaced, toroidal-shaped, electromagnetic coils are enclosed in a cylindrical housing and when supplied with alternating D.C. current, cause a floating armature to reciprocate therebetween. The armature includes a non-conductive linear output dri... | 12/18/1979 |
| 4016439 | Magnetically activated oscillatory motor A magnetically activated oscillatory motor comprises a pendulum pivotally mounted on mounting means, a pendulum magnet mounted on the pendulum with its poles aligned in the direction of pendulum movement, and first and second electromagnets mounted on the... | 04/05/1977 |
