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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 4248157 | Conveyor trolleys A conveyor trolley for transporting articles along an elongated supporting rail and embodying dielectric supporting and retaining wheels and bumpers constituted and arranged so as to effectively electrically insulate the trolley and the article to be tran... | 02/03/1981 |
| 4248158 | Railway hopper car gate outlet actuating mechanism An outlet assembly for application to hoppers of railroad hopper cars and the like, and slidably mounting a gate for movement between open and closed positions, in which the gate slideway is defined by trackway forming members disposed at either side edge... | 02/03/1981 |
| 4248159 | Pivoted railway hopper car door latching mechanism A latching mechanism for a railroad car hopper door. The mechanism includes, a pair of hook-like catches mounted adjacent the hopper door, a pair of latches carried by the hopper door for interlockingly engaging the catches, a pawl which engages one of th... | 02/03/1981 |
| 4248160 | Railway hatch cover and strap latching assembly A small hatch cover is provided which is pivotably mounted upon a hatch cover mounting bracket attached to a car roof. A hatch cover strap is also pivotably mounted upon the hatch cover mounting bracket. The hatch cover strap engages the cover at the cent... | 02/03/1981 |
| 4248161 | Adjustable locking mechanism for tilting tables and the like Two sets of positive-locking tilt adjustment mechanisms are mounted between a drafting board and a supporting frame therefore. Both sets of locking mechanisms include identical left and right halves having crown gear portions positioned thereon for aligne... | 02/03/1981 |
| 4248162 | Table with electrostatic air purifier/cleaner A table having a table top having a top surface. Grilles are provided in the table top and are in flow communication with an electrostatic precipitator for purifying the air. The electrostatic precipitator collects the smoke particles on a filter, the cle... | 02/03/1981 |
| 4248163 | Pallet having densified edge and method of making same A molded unitarily formed pallet is provided, the pallet including wood particles bonded together by a cured binder in compressed relation. Also provided is a method for making such pallets. The pallet includes a deck having an upper supporting surface, a... | 02/03/1981 |
| 4248164 | Sludge drying system with sand recycle A process and system to dry wet sewage sludge with hot sand and to burn the dried sludge. The sand is heated in a heating device by burning dried sludge, and the hot sand is mixed with wet sludge in a drying device. Thereby moisture is driven from the wet... | 02/03/1981 |
| 4248165 | Method and apparatus for sewing a cover upon a ball core A method and apparatus for sewing cover halves together around a baseball core or the like. The method includes the steps of advancing first and second needles in one direction over an edge of a first cover half and under and through an edge of an adjacen... | 02/03/1981 |
| 4248166 | Sewing machine attachment Disclosed is a sewing machine attachment which is adapted to be detachably attached, after opening a part of a machine bed, to the portion of the machine bed in the vicinity of the opened part, and to be operatively connected to a motion mechanism in the ... | 02/03/1981 |
| 4248167 | Safety system to protect sewing machine needles A system is disclosed for minimizing sewing needle breakage on a zig zag sewing machine. A device is included on the sewing machine for sensing the presence of a straight stitch presser foot and, if present, for inhibiting any lateral jogging of the needl... | 02/03/1981 |
| 4248168 | Sewing machine arranged for edge following by needle movement A sewing machine is disclosed wherein the position of the edge of a work fabric is sensed and signals are generated to control the needle jogging mechanism in order to sew a line of stitches a substantially constant predetermined distance from the edge.... | 02/03/1981 |
| 4248169 | Intermittently operable needle thread snubber A sewing machine thread snubber having a fixed part and having a movable part pivoted thereon is provided with mechanism operable by needle bar reciprocating mechanism for moving the pivoted part of the snubber between a needle thread releasing position a... | 02/03/1981 |
| 4248170 | Auxiliary feed mechanism for sewing machines The disclosed invention relates to an auxiliary feed mechanism adapted to maintain an edge of a workpiece in substantial registration with a predetermined path along which the workpiece edge is moved. The invention includes a motor driven auxiliary feed d... | 02/03/1981 |
| 4248171 | Anchor handling and securing assembly An assembly is provided for raising and lowering, and for firmly securing, a type of anchor known as a "Bruce" anchor. The assembly includes the rear channel shaped section for receiving the shank of the anchor when it is stowed, and for mounting the asse... | 02/03/1981 |
| 4248172 | Film cassette An indicating arrangement for indicating the absence or presence of film in the interior of an X-ray film cassette includes an indicating member movably mounted on one portion of the cassette. Another portion of the cassette which is juxtaposed with the o... | 02/03/1981 |
| 4248173 | Shredded meat applicator A granulated meat applicator deposits granulated meat onto a series of pizza shells. A shell or crust conveyor is located beneath a meat conveyor to transfer sauce covered shells beneath the meat conveyor. Frozen shredded meat is deposited onto the infeed... | 02/03/1981 |
| 4248174 | Control system for a slide centrifuge A control system for a slide centrifuge includes a ratio checking circuit which produces a signal when the ratio between the light passing through the slide and the rate of change of this light passes through a predetermined critical value. When this rati... | 02/03/1981 |
| 4248175 | Automatic dog or cat feeder An automatic dog or cat feeder has a plurality of pairs of water and food bowls in a horizontally rotative tray, and a cover assembly for the rotative tray and having a front opening exposing only one pair at a time of the food and water bowls. The cover ... | 02/03/1981 |
| 4248176 | Livestock medicator apparatus A medication mixing and holding tank having a medicated fluid outlet, a pump associated with the tank for pumping medicated fluid from medicated fluid outlet to a livestock watering line, and associated with the tank and pump and outlet recirculating line... | 02/03/1981 |
| 4248177 | Animal waterer with recirculating water system A recirculating animal waterer is disclosed. In one embodiment, the waterer includes a supply conduit which extends from a remote water source underground at a level below the frost line to a first junction located inside a waterer stand. A first nipple e... | 02/03/1981 |
| 4248178 | Poultry watering cup A poultry watering cup (26) having a tubular valve housing (11) with spaced apart annular valve seats (31 and 33), an O-ring (30) on one seat (31), a valve having a head (28) seated on said O-ring (30) and a stem (24) extending loosely through said O-ring... | 02/03/1981 |
| 4248179 | Internally grooved heat transfer conduit A heat transfer conduit is provided having a groove formed in its inner wall and a lip extending along the groove adjacent thereto. The lip and groove inhibit the formation of a vapor barrier between the tube inner wall and heat transfer fluid passed ther... | 02/03/1981 |
| 4248180 | Mechanism for rotating and reciprocating a soot blower A short-stroke steam lance is reciprocated through an opening in a furnace wall. A section of the lance has an extended spiral groove engaged by a protuberance from a supporting framework to force the lance to reciprocate when the lance is rotated by a mo... | 02/03/1981 |
| 4248181 | Vertical steam separator-superheater A vertical steam separator-superheater suitable for drying and superheating steam coming from a high-pressure expansion turbine. The separator-superheater has a common casing (1), enclosing a lower portion (3) which forms a separation zone and an upper portion... | 02/03/1981 |
| 4248182 | Anti-wear additives in diesel fuels An anti-wear compression ignition fuel for use in diesel engines comprising (1) a monohydroxy alkanol having from 1 to 5 carbon atoms, and (2) a wear inhibiting amount of a C8 to C20 aliphatic monocarboxylic acid. Optionally, said fu... | 02/03/1981 |
| 4248183 | Two-stroke cycle diesel engine A two-stroke cycle diesel engine having: at least one two-stroke cycle power cylinder - piston assembly incorporating uniflow scavenging and having two horizontally opposed pistons, at least first and second scavenging ports and two crankcases which may p... | 02/03/1981 |
| 4248184 | Two-cycle diesel internal combustion engine An improved two-cycle Diesel internal combustion engine is provided, whereby the intake and exhaust port passages are modified to provide greater circulation of the combustible fluids and air during the intake and exhaust cycles of the Diesel engine, resp... | 02/03/1981 |
| 4248185 | Two-cycle engine with pure air scavenging A two-cycle internal combustion engine includes a cylinder, a piston in the cylinder and a crankcase pump. The crankcase pump is divided into a first chamber and a second chamber by a membrane. At least one respective transfer passage connects each of the... | 02/03/1981 |
| 4248186 | Exhaust gas recirculation control system An E.G.R. control system includes a pressure modulator operative to modulate the magnitude of the port vacuum as applied to a diaphragm type actuator of an E.G.R. valve. The modulator comprises a housing and a diaphragm assembly disposed in the housing an... | 02/03/1981 |
| 4248187 | Electronic control system for internal combustion engines In a carburetor and an exhaust gas recirculation system adapted to an internal combustion engine, the system comprises a first servomotor to be operated by pneumatic pressure and a first control valve actuated by the first servomotor to control the quanti... | 02/03/1981 |
| 4248188 | Hydraulic attenuator for air fuel control pump A diaphragm operated, air fuel control system for controlling the rate of fuel flow to an internal combustion engine in response to intake manifold pressure is disclosed wherein the transient response of the diaphragm operator is attenuated by a fuel fill... | 02/03/1981 |
| 4248189 | Spark plug and adapter for lean mixture engine cylinders A novel spark plug adapter unit for spark plugs of an internal combustion engine having a main combustion chamber defined by a cylinder bore and its associated piston and a valved intake passage for introducing a lean fuel-air mixture in the combustion ch... | 02/03/1981 |
| 4248190 | Fluid injection apparatus for use with vehicles having on-board compressed air systems An injector apparatus for injecting starting fluid into the cylinders of an internal combustion engine can be operated by an on-board compressed air system of a vehicle. A reserve air tank provides air to operate a fuel delivery mechanism so that the inje... | 02/03/1981 |
| 4248191 | Method and means for preventing valve bridge cracks in cylinder heads of internal combustion engines Method and device to prevent valve bridge cracks in the cylinder head of internal combustion engines. The cylinder head is exposed to compressive stresses acting radially inwards in the region between the valve seats and a surface facing the combustion ch... | 02/03/1981 |
| 4248192 | Internal combustion engine and method of operation thereof with isolated combustion initiation Internal combustion engine wherein a main air fuel charge is ignited by first igniting a pilot air fuel charge and bringing the two charges together, the main charge being compressed before ignition to a higher compression ratio than the pilot charge.... | 02/03/1981 |
| 4248193 | Fuel injection fuel control system FIG. 1 schematically shows a fuel control system for a fuel injected engine. The system includes two vacuum control circuits, essentially identical in valve structure. One circuit controls the recirculation of exhaust gases into the engine intake manifold... | 02/03/1981 |
| 4248194 | Method and apparatus for controlling the operation of a pump An improved method and apparatus is provided to control the rate at which fuel is supplied to an engine by a fuel pump. The fuel pump has an output pressure which varies with pump operating speed in accordance with different curves of a series of curves. ... | 02/03/1981 |
| 4248195 | Apparatus for controlling the duty factor of sequence of cyclically occurring pulses controlling flow through an impedance The duty factor of pulses controlling the time throughout which current flows through an ignition coil is increased or decreased depending upon whether the current through the ignition coil at the last ignition time was less than or greater than the desir... | 02/03/1981 |
| 4248196 | Open loop compensation circuit A closed loop fuel management system is disclosed in which an improved dual integral controller provides both transient and gross correction for an electronic fuel injection system operating at a predetermined air/fuel ratio. The controller has cascaded d... | 02/03/1981 |
