1
Sidney T Fisher, Charles B Fisher: Extraction of hydrocarbons in situ from underground hydrocarbon deposits. Barrigar & Oyen, February 22, 1977: US04008762 (271 worldwide citation)

A method of extracting hydrocarbons in situ from an underground hydrocarbon deposit such as oil shale. A selected part of the deposit is heated by one or more electrical induction coils arranged in a quasi-toroidal configuration to temperatures high enough to drive off hydrocarbon fractions as gases ...


2
Sidney T Fisher, Charles B Fisher: Extraction from underground coal deposits. Barrigar & Oyen, August 23, 1977: US04043393 (258 worldwide citation)

A method of extracting hydrocarbons, energy and other products in situ from an underground coal deposit. A selected part of the coal deposit is heated by electrical induction to temperatures high enough to effect the destructive distillation of coal. The gases and liquids so produced are collected. ...


3
Charles B Fisher, Sidney T Fisher: Multiple-site underground magnetic heating of hydrocarbons. August 17, 1982: US04344483 (255 worldwide citation)

A first underground deposit of lignite or coal is heated by magnetic induction to recover hydrocarbon liquids and gases. The carbon remaining is combusted with air and steam to produce a gas which is combusted to generate electrical energy. The electrical energy is transmitted to second underground ...


4
Sidney T Fisher, Charles B Fisher: Recovery of hydrocarbons from partially exhausted oil wells by mechanical wave heating. Barrigar & Oyen, September 20, 1977: US04049053 (238 worldwide citation)

Underground viscous hydrocarbon deposits, such as the viscous residues in conventional oil wells, are heated by mechanical wave energy to fluidize the hydrocarbons thereby to facilitate extraction thereof. For uniform, circular, symmetrical dispersion of mechanical wave energy of high-power and low- ...


5
Charles B Fisher, Sidney T Fisher: Synchronous detection with sampling. February 24, 1981: US04253066 (91 worldwide citation)

In receiving apparatus for a double-sideband amplitude-modulated wave, a synchronous detector which samples the modulated wave for short periods centered on instants of peaks of the carrier at regularly-occurring intervals, with a sampling frequency greater than the Nyquist frequency for the modulat ...


6
Charles B Fisher, Sidney T Fisher: Noise-reduction sampling system. December 29, 1981: US04308614 (90 worldwide citation)

This invention provides means and method of eliminating a selected wave from a frequency band containing a plurality of waves, by sampling the plurality of waves at a rate greater than the nyquist rate for the frequency band in herz, at instants at which the selected wave has zero amplitude, and int ...


7
Charles B Fisher, Sidney T Fisher: Periodic wave elimination by negative feedback. June 26, 1984: US04456990 (88 worldwide citation)

Means and method for substantially eliminating a selected periodic wave from a frequency band-limited combined wave containing other waves. The combined wave is sampled in a sampling gate, opened by short gating pulses with a frequency equal to the selected frequency divided by an integer, and great ...


8
Sidney T Fisher, Charles B Fisher: Exraction of hydrocarbons in situ from underground hydrocarbon deposits. R H Barrigar, August 3, 1976: US03972372 (59 worldwide citation)

A method of extracting hydrocarbons in situ from an underground hydrocarbon deposit (such as petroleum or lignite). A selected part of the deposit is heated by electrical induction to temperatures high enough to drive off hydrocarbon fractions as gases or vapors, which are then collected. The deposi ...


9
Sidney T Fisher, Charles B Fisher: Electric induction heating of underground ore deposits. Barrigar & Oyen, October 26, 1976: US03988036 (39 worldwide citation)

A method of extracting metal from an underground ore body. The body is heated by electric induction to a temperature sufficient to break up the metallic ore compound and liquefy the metal. The metal flows into production wells where it is collected and transported to the surface, as by rapid solidif ...


10
Charles B Fisher, Sidney T Fisher: Measurement of evoked nervous system potentials. January 13, 1981: US04244376 (26 worldwide citation)

Steady-state evoked potentials from the nervous system, measured on the scalp and elsewhere on the body in response to specific periodic sensory stimuli, contain the fundamental frequency of the stimulus and other waves, and are of the order of 40 dB below potentials due to general electrical activi ...



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