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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 6348847 | Control device for breaker A making operation preventing device 130 has a releasing trigger 19 for retaining, via a releasing latch 18, a breaking lever 36 to which a torque in a counterclockwise direction is applied by an opening torsion bar 34; a releasing electromagnet 20 for op... | 02/19/2002 |
| 6150909 | Electromagnetic switching device An electromagnetic switchgear unit has an electromagnetic drive appliance which acts as an auxiliary magnet system and by means of which the contact force is first increased on the occurrence of a short-circuit current, before the contacts are abruptly to... | 11/21/2000 |
| 5986528 | Electrical switching device An electrical switching device prevents moving contacts from welding to stationary contacts in a switching device. This is achieved using an auxiliary magnet system in the main current path, which system produces a contact pressure force corresponding to ... | 11/16/1999 |
| 4893102 | Electromagnetic contactor with energy balanced closing system An electromagnetic contactor or motor controller is taught in which an energy efficient bounceless contact closing operation is utilized. An electromagnetic closing coil voltage is sensed by the contactor control system and compared against a memory menu ... | 01/09/1990 |
| 4746778 | Circuit breaker with an actuating device and an energy accumulator An energy accumulator for a circuit breaker comprises a cross piece which can be inserted between side walls of the support mechanism of the circuit breaker, which has a substantially U-shaped cross section and against the center part of which coil compre... | 05/24/1988 |
| 4739293 | Electromagnetic contactor with reduced noise magnetic armature An electromagnetic contactor is taught having an E-shaped movable magnetic armature and a complementary E-shaped permanent magnet. The outboard legs of the E-shaped members abut at closure. Each of the central legs of the complementary magnetic members ha... | 04/19/1988 |
| 4713640 | Molded-case circuit breaker with improved contact arm assembly, toggle link means and arc shield component The pivot shaft which couples the contact arm to the side support plates of a molded-case type circuit breaker is provided with a pair of spacer members that hold the contact arm in precise centered position relative to the support plates and prevent the ... | 12/15/1987 |
| 4638277 | Circuit breaker with blow open latch An electric circuit breaker with blow open contact arm characterized by a pair of separable contacts one of which is mounted on a contact arm that is rotatably mounted on mounting bracket. The contacts maintain a repulsion magnetic force which operates to... | 01/20/1987 |
| 4635012 | Contactor structure of circuit breaker Individual movable contactors of a circuit breaker are made up of a pair of conductors. The first conductor has one end bifurcated to form a pair of legs separated by a slit. At the open end each leg has a curved inner portion the opposed curved portions ... | 01/06/1987 |
| 4608545 | Movable contact arm assembly for a current limiting circuit breaker A movable contact arm assembly is provided for a circuit breaker. The contact assembly includes a carrier which has first and second guide plates with aligned roller guides and bracket supports and a roller which has a middle portion extending between the... | 08/26/1986 |
| 4553119 | Electric circuit breaker having reduced arc energy An electric circuit breaker having fast short circuit response along with reduced arc energy is provided by means of a current limiting contact arm arrangement. The contact arm is arranged to pivot independently of the circuit breaker operating mechanism ... | 11/12/1985 |
| 4480242 | Variable torque contact arm for electric circuit breakers A movable contact arm for circuit breakers allows the contact opening characteristics to be determined over an entire range of breaker ratings. The contact arm is provided with a camming surface with the contact closure spring arranged as a cam follower. ... | 10/30/1984 |
| 4465992 | Double-pole double-throw proximity switch A magnetically actuated proximity switch is provided with a double-pole double-throw contact arrangement. To substantially equalize the contact pressures between the two poles a movable armature, to which the movable contacts are firmly attached, is loose... | 08/14/1984 |
| 4323945 | Polarized electromagnetic relay A polarized electromagnetic relay includes two contact springs extending substantially parallel to each other. One of the contact springs forms a movable contact for cooperation with a fixed contact. In the contacting condition, the free ends of the contact ... | 04/06/1982 |
| 4227161 | Current limiting circuit breaker with pivoting contact arm A current limiting circuit breaker includes two parallel pivoting contact arms carrying contacts at the ends thereof. The upper arm is double pivoted and is operated by a mechanism between open and closed positions. A magnetic drive slot motor device surr... | 10/07/1980 |
| 4225838 | Electro-magnetic relay with first and second spring biasing means A high sensitivity electromagnetic relay has a moving armature held against two pole pieces of a magnetic circuit by means of a permanent magnet. The armature is subject to the action of two return springs which tend to draw the armature off the pole piec... | 09/30/1980 |
| 4114123 | Circuit breaker A high performance, manually and automatically operable, trip-free magnetic circuit breaker incorporates compact, readily accessible calibration means in which the direction of application of a substantially constant spring force is varied to permit conve... | 09/12/1978 |
| 4095200 | Contactor having reduced contact bounce and shorter arc time A DC contactor providing increased magnetic efficiency, reduced contact bounce, and shorter arc time has a movable contact carrier bar pivotally mounted relative to a clapper armature so as to prevent tilting about its longitudinal axis and eliminate rota... | 06/13/1978 |
| 4058781 | Double pole contact operating mechanism A double pole double throw relay has two flexible electrically conductive contact arms which each carry an electrical contact positioned to engage cooperating contacts. Contact closing pressure is simultaneously applied to both contact arms by a yoke made... | 11/15/1977 |
| 4024364 | Pressure switch mechanism and cam stop arrangement therefor An improved calibration mechanism is provided for use on a pressure switch having an adjustable, spring biased plunger arrangement for controlling the pressure level required to actuate the switch. The mechanism includes a support bracket, a cam rotatably... | 05/17/1977 |
| 4006439 | Circuit interrupter having an insulated bridging contact A circuit interrupter particularly suitable for use in an oil filled distribution transformer having an elongated contact arm pivotable about one end with a movable contact attached to the other end through suitable insulating members to electrically isol... | 02/01/1977 |
