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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 |
| 4086576 | Axle load monitoring systems The deflection of an axle when under load is monitored by at least one load monitoring device mounted on the axle. At least one pair of strain gauge elements forms each load monitoring device, the strain gauge elements of each pair being arranged to measu... | 04/25/1978 |
| 4075616 | Detector for alarm system Sensing devices responsive to changes in the physical condition of the area in which they are located are disposed in elongate, flexible carriers to form a detecting unit which can be arranged in a tortuous, undulating array to cover an undefined area of ... | 02/21/1978 |
| 4048850 | Mechanism for gauging the catch within a trawl net The present invention is related to a mechanism for guaging the expansion of a trawl net in correspondence with the number of fish caught within the trawl. The mechanism includes sensors adapted to be fastened to the masks of the trawl net in order to sen... | 09/20/1977 |
| 4038639 | Bird perch alarm A bird perch alarm characterized by a perch assembly responsive to the weight of a bird, the movement thereof completing electrical circuitry and causing an audible signal. Resilient means form a part of the perch assembly, affording critical sensitivity ... | 07/26/1977 |
| 4034361 | Method and apparatus for storing biological matter The supply of cryogenic fluid used for controlled storage environment of biological materials is monitored so as to insure an adequate level. The monitoring is effected by employing a beam balance mechanism. Counterweights associated with the beam balance... | 07/05/1977 |
| 4023151 | Communication appliance operating device A communication appliance is located to present predetermined information and is automatically turned on and off. A pair of switches are arranged to be actuated in sequence by a person approaching the communication appliance, and a control device responds... | 05/10/1977 |
| 4020482 | Patient monitor An elongated air inflated flexible bag is placed below the mattress of a hospital or nursing home bed and connected to a pressure actuated electrical switch signal at a remote attendant's station. The switch is a normally closed low pressure switch that r... | 04/26/1977 |
| 4005296 | Disc switch Apparatus adapted for cooperation with the human foot for performing a switching function in response to ambulation. A substrate is provided with a generally centrally located contact. Posts extend from the substrate and space a flexible disc from the con... | 01/25/1977 |
| 4003487 | Truck overload protective system having trip signal sampling means An overload protective system continuousy monitors the forward overturning moment on a counterbalanced lift truck and prevents further raising of the carriage or further forward tilting of the mast when the tilting moment is excessive. A strain gage senso... | 01/18/1977 |
| 3992706 | Liquid level monitoring apparatus Apparatus for monitoring the drop of the level of the liquid in a plastic bag that is used during the intravenous administration of a solution includes a housing in which switch means having an integral, spring actuated contact means is mounted with the s... | 11/16/1976 |
| 3991415 | Alarm and light system A combination alarm and lighting system for being installed in a home so that when a person steps upon a door mat outside of the door home it closes an electrical circuit to a door bell and an electric lamp; the system accordingly including electrical cir... | 11/09/1976 |
| 3982238 | Time based monitoring system A monitoring system for the notification of locations external to the area being monitored of a prolonged absence of motion within the area being monitored is disclosed consisting of a clock, an electronic counter designed to record the pulses emitted per... | 09/21/1976 |
| 3976921 | Triggering circuit Circuit for triggering an electrical signal for actuation of an electrical mechanism. The circuit includes a switch means for producing an electrical pulse and a means for reversing the current flow upon receipt of such electrical pulse both connected in ... | 08/24/1976 |
| 3974491 | Load signaling device for a patient's foot A device for signaling a patient when a predetermined load is placed on the patient's foot comprises a resilient foot pad having a toe end and a heel end and adapted to substantially cover the inner sole of a shoe. A resilient liquid filled tube is mounte... | 08/10/1976 |
| 3971008 | Crane overload detector using a boom bending moment detector For a crane having a boom for hanging loads apparatus for detecting overload is provided which comprises a boom bending moment set value generator, which is determined by a variable quantity corresponding to the operating radius of the crane, a boom bendi... | 07/20/1976 |
| 3965464 | Device for automatically detecting overload on aerial ladder truck A safety device is provided for association with an aerial ladder truck assembly to automatically detect a weight overload on the ladder unit of the assembly at any given angle. The safety means are characterized by providing ladder angle detecting means ... | 06/22/1976 |
| 3964057 | Fire alarm and protection booth A fire alarm and protection booth having means therein for signalling an alarm to a fire station and/or police station as well as providing refuge in the case of an emergency. The booth comprises an enclosure having a door and a foot treadle which are cou... | 06/15/1976 |
| 3961201 | Patient monitoring A tape switch near the edge of a bed frame closes a warning signal circuit when the weight of a patient near the edge of the bed presses on an actuating switch arm that is cantilevered from the bed frame.... | 06/01/1976 |
| 3958527 | Automatic product depletion indicator The indicator of this invention comprises a product "empty" signal means actuated responsive to the product container achieving an empty condition, automatically actuating the empty signal means, to provide a visual empty signal, so that the user will be ... | 05/25/1976 |
