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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 |
| 5024273 | Cementing apparatus and method Apparatus is disclosed for use in placing cement within the annulus between a casing string and a well bore in which the casing string is suspended, such apparatus including a stage collar connectible as part of the casing string and having a packing elem... | 06/18/1991 |
| 5024274 | Method and apparatus for enhanced oil recovery An enhanced oil recovery well system and method providing for simultaneous heated vapor or hot liquid injection of usually water into one or more formations in a well through a single conduit. The well system utilizes injection mandrels selected to provid... | 06/18/1991 |
| 5024275 | Method of recovering hydrocarbons using single well injection/production system Production of viscous hydrocarbons is initiated by first injecting an injection fluid down at least two tubing strings in a wellbore having multiple tubing strings therein. Following an initiation phase, flow of injection fluid in the production tubing st... | 06/18/1991 |
| 5024276 | Hydraulic fracturing in subterranean formations This invention provides a process for the hydraulic fracturing of a subterranean formation, which comprises introducing into the formation under fracturing pressure a fracturing fluid comprising solid particulate suspended in a fluid dispersion comprising... | 06/18/1991 |
| 5024277 | Running tool for use in well bores A running tool and method for the use thereof in locating apparatus in a well bore includes an elongated hollow tool body and outer sleeve encircling the body; a mandrel disposed within the body and sleeve and carrying a collet on the lower end thereof wh... | 06/18/1991 |
| 5024278 | Harvesting machine having blower damage prevention means A harvesting machine is especially adapted for automatic topping and loading of crops, such as onions. The crops are gathered from the field and elevated on a conveyor to a region adjacent to which a topping device (a sickle) is disposed. The conveyor has... | 06/18/1991 |
| 5024279 | Foldable implement carrier A foldable implement carrier is disclosed including a central support bar supporting two pivotally connected tool bar sections which are movable from a laterally extended position to a folded position to reduce the width of the foldable implement carrier ... | 06/18/1991 |
| 5024280 | Soil leveling apparatus with improved frame and hitch An improved soil leveling apparatus (10) includes a frame (12), connecting hitch means (14), and adjustable lost motion linkage (48) secured to the top connection point (52) of the hitch, and an optional scarifier assembly (16) which is supported on a con... | 06/18/1991 |
| 5024281 | Reversible moldboard plow A reversible moldboard plow has a plow carrying beam swingably mounted at the rear crossbar of a frame which carries trunnion mounted cylinders connected to the beam for moving the beam, the front of the frame carrying hitch pins for connection to a tract... | 06/18/1991 |
| 5024282 | Electronic postal rating scale operable in metric and avoirdupois weight units An electronic postal scale measures the weight of an item in metric or in avoirdupois units, at the user's election. The scale also calculates a postal or shipping rate for the item, in accordance with a stored rate table defined in either metric or avoir... | 06/18/1991 |
| 5024283 | Pivotable, resilient mounting A tiltable element, e.g. an operator's cab, is resiliently supported on a body frame by a plurality of pivotable mounting devices. Each device comprises a pair of parallel bracket members and a support element. The support element and the bracket members ... | 06/18/1991 |
| 5024284 | Apparatus for running a car at constant speed The present invention relates to an apparatus for running a car at constant speed, the apparatus controlling the car to run at a desired speed, wherein by a control circuit (21), both a car-speed deviation and an acceleration are taken as variables, and a... | 06/18/1991 |
| 5024285 | Slippage preventing apparatus for a vehicle As slip amounts or amounts of slippage of the driven wheels on pavement get larger, the torques to be applied to the driven wheels are reduced. The slip amounts of the driven wheels are determined on the basis of a vehicle speed and rotational speeds of t... | 06/18/1991 |
| 5024286 | Motor assisted pedal cycle A motor assisted pedal cycle (30) comprises a pair of pedals (32) connected by crank arms (1,2) to a pedal shaft (3) which is connected to a hub (7) by means of a torsion spring (5). The hub (7) carries a drive sprocket (8) for a chain (36) to connect the... | 06/18/1991 |
| 5024287 | Engine unit for vehicle Several embodiments of power units particularly adapted for transverse engine operation for driving the wheels of a motor vehicle. In all of the embodiments, the axles are disposed on one side of the engine and a change speed transmission is located on th... | 06/18/1991 |
| 5024288 | Sound attenuation apparatus Apparatus for reducing acoustic transmission from mechanical or acoustic sources by means of a double wall partition, within which an acoustic pressure field is generated by at least one secondary acoustic source. The secondary acoustic source is advantag... | 06/18/1991 |
| 5024289 | Insulated double-walled exhaust pipe A double-walled cylinder in the form of an exhaust pipe, muffler, or catalytic converter is provided less heat or sound conductive in its radial direction by filling the annular gap between the inner and outer cylinder with low-density, high-temperature r... | 06/18/1991 |
| 5024290 | Sound absorbing panel for interior walls A sound absorbing panel (1) is disclosed having several grooves (3a,3b) opening in the shape of a funnel in parallel opposite surfaces. At their intersections the grooves (3a, 3b) form relatively small holes. The grooves (3a, 3b) exhibit a funnel-shaped c... | 06/18/1991 |
| 5024291 | Ladder assembly A ladder assembly for ease of access to a wharf or pier is disclosed. The ladder assembly includes a pair of vertical frame members having channels therein which are disposed about a ladder which is free to move upwardly and downwardly within the channels... | 06/18/1991 |
| 5024292 | Portable ladder assembly for truck trailers A portable ladder assembly adapted to be removably mounted in the space between a body and a rail spaced therefrom, e.g. between the body of a conventional truck trailer and tie down rail. The ladder has a main ladder section having an elongated vertical ... | 06/18/1991 |
| 5024293 | Emergency ladder equipment The present invention discloses an emergency ladder equipment. Such an emergency ladder equimpment is mounted on the outside wall of the top floor of buildings. The emergency ladder equipment substantially comprises a number of ladder members which are st... | 06/18/1991 |
| 5024294 | Differential pressure transducer A differential pressure sensor indicating a housing forming a high pressure chamber, a nozzle mounted on the housing at one end of the chamber, a diaphragm mounted in the chamber to form a low pressure chamber in the nozzle, a spring retainer in the high ... | 06/18/1991 |
| 5024295 | Relative system response elevator dispatcher system using artificial intelligence to vary bonuses and penalties An elevator system employing a micro-processor-based group controller (FIG. 2) communicating with the cars (3, 4) to assign cars to hall calls based on a Relative System Response (RSR) approach. However, rather than using unvarying bonuses and penalties, ... | 06/18/1991 |
| 5024296 | Elevator traffic "filter" separating out significant traffic density data A computer based elevator system (FIG. 1) including data "filtering" means evaluating at least part of the system's over-all operational, historic data base, determining when significant traffic density was present in the system and then selecting out suc... | 06/18/1991 |
| 5024297 | Torque transmitting beam for wheel having brake torque drives An improved torque lug drive for a multidisc brake and wheel assembly having greater resistance to torque loading than earlier designs at lower weight. The torque transmitting beam is mechanically secured to the radially inner surface of the wheel rim adj... | 06/18/1991 |
| 5024298 | Apparatus and method of automotive brake with booster piston A vehicle wheel braking system activated by a master cylinder is provided including a rotor connected to a vehicle wheel, a bracket having a position fixed with respect to the rotor, and a caliper slidably mounted with respect to the bracket in a plane ge... | 06/18/1991 |
| 5024299 | Electric drum brake An automotive vehicle drum brake including a brake drum for connected to the vehicle wheel and a backing plate for connected to the vehicle. At least one brake shoe is and pivotally mounted with respect to the backing plate. A non-rotative nut mounted for... | 06/18/1991 |
| 5024300 | Disc brake rotor and wheel assembly A vehicle wheel and rotor assembly is provided for use with a vehicle having a disc-type brake. The assembly includes a wheel for threaded connection with an axle and a rotor. The rotor has a core section joined to an annular ring section and the core sec... | 06/18/1991 |
| 5024301 | Hydraulic rebound stop assembly for a shock absorber A shock absorber has a rebound stop assembly. The rebound stop assembly is mounted to the piston rod and includes an outer housing assembly slidably disposed within the working cylinder of the shock absorber and an inner housing member secured to the pist... | 06/18/1991 |
| 5024302 | Apparatus for damping courses of motion An apparatus for damping movement courses of two bodies, in particular in a vehicle wheel/vehicle suspension system, having a piston sliding in a cylinder and dividing it into two work chambers, the two work chambers arranged to communicate with one anoth... | 06/18/1991 |
| 5024303 | Hatchback locking device The locking device may either be used with a conventional liftgate support or incorporated into the design of the liftgate support, to retain a hatchback-type door of a vehicle in an open position. The locking device of the present invention is for use wi... | 06/18/1991 |
| 5024304 | Vacuum brake force booster with acoustic insulation To substantially eliminate the noise arising upon actuation of a vacuum brake force booster caused by incoming air, the housing section confining the ventable working chamber and/or the intervals in the control valve housing are lined with an insulating c... | 06/18/1991 |
| 5024305 | Method for controlling vehicle transmission systems In a method for automatically controlling a vehicle transmission system having a gear-type transmission and a clutch, in the case where the system is controlled in a control mode wherein the clutch is disengaged so as to prevent idle running of the vehicl... | 06/18/1991 |
| 5024306 | Propelling drive control apparatus for working vehicle A propelling drive control apparatus for a working vehicle comprising hydraulically operable friction clutches, a first clutch control valve for selecting between the friction clutches, and a second clutch control valve connected in series to the first cl... | 06/18/1991 |
| 5024307 | Free wheel hub system A free wheel hub system comprises a free wheel hub mechanism disposed between a drive shaft and an axle hub supported by a spindle, an electric motor mounted on a hub body accommodating the free wheel hub mechanism, a brush case mounted on the hub body an... | 06/18/1991 |
| 5024308 | One-way clutch and holder for torque transmitting members thereof In a one-way clutch comprising an inner ring and an outer ring, a plurality of torque transmitting members disposed between the rings, and a holder for holding the torque transmitting members, the holder includes an annular body, a first guide arrangement... | 06/18/1991 |
| 5024309 | Rotational speed differential responsive type control coupling A rotational speed differential responsive type control coupling is provided with a device for manually or automatically preventing relative rotation of a drive housing and rotor in order to prevent working oil from being heated up to an excessively high ... | 06/18/1991 |
| 5024310 | Clutch pressure control device for continuously variable transmission A continuously variable transmission has a fixed pulley piece and a movable pulley piece supported on the fixed pulley piece so that the movable pulley piece can be moved toward and away from the fixed pulley piece, the width of a groove between the piece... | 06/18/1991 |
| 5024311 | Electromagnetic spring clutch The present invention relates to an electromagnetic spring clutch. A conventional field core is formed in a bottomed cylindrical shape, so manufacturing such a field core is troublesome and uneconomical. When a through-hole through which shafts are insert... | 06/18/1991 |
| 5024312 | Boat support roller assembly A roller assembly for supporting a boat on a trailer which has a hub with a resilient surface, and wherein the hub rotates on a cat's eye-shaped bushing which allows limited swivel and acts as a positive guide to the boat hull for providing straight line ... | 06/18/1991 |
