The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 4055082 | Net oil computer A net oil computer which can gate out turbine meter pulses by producing gating pulses of time widths To and/or Tw directly proportional to percent oil, by volume, and/or percent water, by volume, respectively, flowing as a mixture in... | 10/25/1977 |
| 4048854 | System for determining the ratio of oil to water in a metered fluid stream A system for metering a fluid stream constituted by a mixture of oil and water to determine the volumetric ratio of oil-to-water in the stream. The system includes a vortex meter through which the stream is conducted to produce a meter signal whose freque... | 09/20/1977 |
| 4010645 | Density-responsive mass flow vortex type meter A system for measuring the mass flow of a fluid stream wherein gas is interspersed with liquid, the system providing separate mass flow readings for the gas and liquid. The system includes a mass flow vortex-type meter having a flow tube through which the... | 03/08/1977 |
| 4010643 | Measuring device for tapping apparatus for foam-forming beverages Measuring device for beverage-tapping apparatus having a feed line from a supply source to a measuring chamber, a volume measuring device with a meter connected thereto, and a valve outlet behind the measuring chamber with a valve, comprising primary elem... | 03/08/1977 |
| 3952592 | Fluid sensing systems A net oil computer including a vibration densitometer and a turbine flowmeter. The flowmeter produces output pulses at a frequency directly proportional to the rate of volume flow through a pipeline. The output of the flowmeter is impressed upon the pole ... | 04/27/1976 |
| 3934471 | Flow monitoring system The invention provides a novel form of mechanism for monitoring the rate of passage of a material dispersed in a fluid stream, which mechanism may be of use in the control of a plant for recovering the material from the fluid. The mechanism comprises mean... | 01/27/1976 |
| 3934470 | Method for measuring the flow rate of the gases coming out of an oxygen converter In a process for measuring the flow rate of a gas formed in an oxygen conversion process in which conversion process oxygen is introduced into an oxygen converter containing a material to be oxidized and gaseous effluent, including a gas formed in the oxy... | 01/27/1976 |
| 3933038 | Volumetric determination of contaminated liquid or gaseous media The volume of liquid or gaseous media contaminated with solids is measured discontinuously. To this end, an accurately measured volume of a pure medium is passed through a measuring device intended for measuring the volume of a contaminated medium. The nu... | 01/20/1976 |