The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4164832 | Tongue and groove structure in preformed wall sections Preformed wall sections having two spaced outer panels with interfitting tongue and groove structure disposed in opposite edges adjacent an outer panel are improved by construction of the tongue and groove to relieve the tendency to chip or damage the pan... | 08/21/1979 |
| 4164833 | Skip-seal mechanism for packaging machine A machine for heat sealing articles between two continuous webs of plastic material comprises two parallel synchronously driven shafts, each of which has a pair of wheels on it which are brought into pressure relationship for heat sealing. One shaft is mo... | 08/21/1979 |
| 4164834 | Junior stirrups attachment for adult-size saddle A flexible, main strap has a stirrup attached to each end, a forward-extending loop fixed to the center of the main strap, and a small, forward-extending strap also fixed to the main strap. The loop is passed through the typical opening under the pommel o... | 08/21/1979 |
| 4164835 | Grass cutter A cutting device designed to shear vegetation such as grass comprising an endless cutting member laced about drive and idle pulleys. The endless cutting member comprises, in the first embodiment of this invention, an endless cable wrapped circumferentiall... | 08/21/1979 |
| 4164836 | Bulky yarn producing apparatus Herein disclosed is an apparatus for producing a bulky yarn like natural fibers. The apparatus comprises a twist mechanism provided on a yarn travelling path for twisting and untwisting a yarn; a rubbing mechanism provided on the yarn travelling path of t... | 08/21/1979 |
| 4164837 | Method of forming a wrapped yarn A yarn is described composed of an untwisted staple sliver and of at least one filament wound around this sliver. The denier of the winding filamentary yarn is under 50 dtex, the elongation at break of the winding filamentary yarn is at least as great as the ... | 08/21/1979 |
| 4164838 | Process for the production of synthetic endless filaments with good crimping properties The invention is related to a process for the stretch-texturing of high-molecular weight linear synthetic endless filaments travelling at speeds of 300 to 1200 meters per minute by continuously guiding the filaments through a delivery zone, a heat-fixing ... | 08/21/1979 |
| 4164839 | Yarn process The invention relates to a process for the manufacture of a core/skin or core/sheath yarn, whose skin- or sheath-forming filament is wrapped around the core yarn in alternating "S" and "Z" directions. It relates furthermore to a device to carry out the pr... | 08/21/1979 |
| 4164840 | Method and apparatus for twisting yarns Yarns or filaments from producers packages, having little or no twist therein and mounted upon two-for-one spindle units, are uptwisted, directed to a ply twisting unit where the twisted filaments are plied and downtwisted onto a takeup bobbin of a spindl... | 08/21/1979 |
| 4164841 | Method and apparatus for continuous formation of bulked and entangled multifilament yarn A bulked and entangled multifilament thermoplastic yarn and an improved process for the formation thereof which, when tufted into a fabric, presents a grass-like appearance. The yarn is made by melt spinning and water quenching filaments of a melt spinnab... | 08/21/1979 |
| 4164842 | Buffer amplifier circuit A buffer amplifier circuit comprising complementary MOS transistors and used as a load driving circuit for effecting ON and OFF of a relatively large current flowing through a small electronic device such as a crystal time piece and the like. The circuit ... | 08/21/1979 |
| 4164843 | Metallic lead plate and circuit structure for an electronic watch and method of assembly A circuit structure for an electronic watch including a metallic lead plate which is overlapped on a circuit base plate and circuit case is provided. The metallic lead plate and circuit base plate are formed with receiving openings in regions of the circu... | 08/21/1979 |
| 4164844 | Timepiece display indicator The invention concerns a solid state timepiece which provides chronograph nctions and in which a single display unit is adapted to display either an elapsed time or the time of day. To distinguish when the chronograph function is being carried out within ... | 08/21/1979 |
| 4164845 | Rotary compressors A flow stabilizer is presented which equalizes the flow of fluid through the passageways of the channel diffuser used with a centrifugal type rotary compressor. Slots are formed in the sidewalls of the flow separating vanes in the diffuser. The slots open... | 08/21/1979 |
| 4164846 | Gas turbine power plant utilizing a fluidized-bed combustor The gas turbine power plant with a fluidized-bed combustor for the burning of coal comprises a closed circuit or loop cooling system for the fluidized-bed combustor through which is circulated liquid metal. The cooling system includes, in the bed of the f... | 08/21/1979 |
| 4164847 | Method for combustion of gaseous fuels and flue gases A method for combustion of gaseous fuels and flue gases in which the heat content of the combustion products is partially recycled to the combustion process by heat exchange with combustion air and/or gas, and air and gas are fed to a reaction chamber, wh... | 08/21/1979 |
| 4164848 | Method and apparatus for peak-load coverage and stop-gap reserve in steam power plants An arrangement for storing energy to cover peak-load conditions and serve as a stop-gap reserve in steam power plants. A live steam generator is connected to a steam turbine, and a storage vessel is provided with a steam cushion volume and a water content... | 08/21/1979 |
| 4164849 | Method and apparatus for thermal power generation A method and apparatus for power generation from a recirculating superheat-reheat circuit with multiple expansion stages which alleviates complex control systems and minimizes thermal cycling of system components, particularly the reheater. The invention ... | 08/21/1979 |
| 4164850 | Combined engine cooling system and waste-heat driven automotive air conditioning system An improved engine cooling system is combined with an automotive air conditioning system for utilizing otherwise waste heat from an engine to vaporize refrigerant fluid which is condensed and pumped back to the engine in a closed cycle. In a cooling mode,... | 08/21/1979 |
| 4164851 | Beverage container cooler A device for rapidly cooling a canned or bottled beverage having a cooling compartment in which two rollers are horizontally disposed to support and cause to rotate a horizontally positioned cylindrical beverage container, an ice retaining member angularl... | 08/21/1979 |
| 4164852 | Fan motor unit for room air conditioner A fan motor unit for use in combination with a room air conditioner has two separate motors formed in a unitary housing for separately driving the evaporator and the condenser coil fans. By tailoring the characteristics of each motor to the requirements o... | 08/21/1979 |
| 4164853 | Cooler A cooler for barrels of beer is comprised of a container which supports the barrel and has a sufficient volume to envelope the barrel and is adapted to contain a cooling media. The container has a top and bottom which are removably sealable to isolate the... | 08/21/1979 |
| 4164854 | Desalination method with mercury refrigerant A salt water purification apparatus and process utilizes a vertically arranged elongated tank in which salt water is first frozen into a solid block and then melted to provide pure water. The freezing is accomplished by injecting into a column of salt wat... | 08/21/1979 |
| 4164855 | Segmented driving shaft Disclosed is an improved segmented driving shaft in which the torque is transmitted from roll segment to roll segment through flexible gear-type couplings. The shaft includes a plurality of alignment tubes which reduces the angle of misalignment of the ge... | 08/21/1979 |
| 4164856 | Yarn end collection A circular knitting machine includes a cylinder with knitting instrumentalities and a cam arrangement for operating the instrumentalities, the cylinder and the cam arrangement being relatively rotatable, a striper associated with the cam arrangement and h... | 08/21/1979 |
| 4164857 | Plugless pin tumbler cylinder A cylinder which does not have a plug but has selectors and cooperating pin tumblers controlled thereby under influence of a key which is thrust rectilinearly into the key way and which selectors are actuated by a bolt or the like.... | 08/21/1979 |
| 4164858 | Rolling mill with roll bending unit A rolling mill includes an assembly which can be withdrawn from the two housings. The assembly has two rolls with each roll having a pair of bearing chocks on the roll necks and a pair of further chocks positioned outwardly of the bearing chocks one on ea... | 08/21/1979 |
| 4164859 | Wire accumulator A frictional coupling adjusting mechanism for a double block accumulator including means for limiting the rate at which the coupling force may be increased after a predetermined force is reached, and also limiting the total coupling force that may be appl... | 08/21/1979 |
| 4164860 | Internal gaseous fluid stripper for can bodymakers and the like A reciprocal ram at commencement of a forward stroke engages a cup-shaped article carrying it through metal working dies and against a doming die at reversal into a rearward stroke immediately followed by stripping of the article from the ram. The ram has... | 08/21/1979 |
| 4164861 | Leak standard generator A leak standard generator which utilizes the diffusion properties of a gas or vapor to deliver a uniform rate of flow of a leak sample into a diluent gas stream. The generator includes a reservoir containing the leak sample, a discharge head through which... | 08/21/1979 |
| 4164862 | Multicomponent thermal conductivity analyzer Apparatus for measurement of gases in a multiple component gas stream or sample is disclosed. A regulated pressure system delivers the gas to N thermal conductivity type detectors utilizing wheatstone bridges. The thermal conductivity detector utilizes a ... | 08/21/1979 |
| 4164863 | System and method for analyzing tonosignals A system and method analyzes tonosignals and other electrical signals representative of force-displacement information from applanating probes such as those initially to determine the presence of an acceptable waveform or tonosignal. Once an acceptable wa... | 08/21/1979 |
| 4164864 | Method and apparatus for supporting a sensor in a normally inacessible area of a machine A noncontacting axial position monitor or probe is carried on an extending rod which reaches into a normally inaccessible area and there is provided adjusting means operable to effect an internal position adjustment of the probe externally of the device b... | 08/21/1979 |
| 4164865 | Acoustical wave flowmeter A flowmeter for accurately determining the rate of flow of a gas substantially independent of its molecular composition and also for determining a measure of the velocity of sound in that gas. The gas flows through a transducer assembly. Disposed in the t... | 08/21/1979 |
| 4164866 | Apparatus for monitoring amount and directions of fluid flow in fluid power systems A bladed rotor is mounted for rotation within a conduit for carrying fluid. A sensing element is also installed in the conduit and the sensing element and the rotor together, when connected in an electrical circuit, are capable of differentiation between ... | 08/21/1979 |
| 4164867 | Method of measurement of bulk temperatures of gas in engine cylinders The bulk temperature of the gas in a piston engine during combustion is determined by detecting the high frequency pressure oscillation in the combustion chamber operating the engine to produce knock and measuring the frequency of the lowest frequency mod... | 08/21/1979 |
| 4164868 | Capacitive humidity transducer A capacitive humidity transducer wherein an electrically non-conductive base carries at least a pair of electrically conductive coatings which are spaced from each other. A dielectric film which is active with respect to water absorption is also carried b... | 08/21/1979 |
| 4164869 | Thermostat system for radiant room heating A receiver of thermal radiation of thin film deposit material of high temperature coefficient of electrical resistance having surface absorptive characteristics.... | 08/21/1979 |
| 4164870 | Pipettes A fixed stroke pipette having a measuring piston that controls the volume of liquid aspirated into the pipette reservoir and a larger piston that assures the expulsion of all the aspirated liquid during a discharge stroke. An improved piston arrangement p... | 08/21/1979 |
| 4164871 | Push drill guidance indication apparatus An electronic guidance system for a push drill that is remotely guided by the operator. The system functions to maintain continual indication as to the attitude of the drilling apparatus, i.e., pitch, roll and distance to rock formations overlying or unde... | 08/21/1979 |