A device is described for indicating and preventing damage to voltage cells such as galvanic cells and fuel cells connected in series by detecting sequential voltages and comparing these voltages to adjacent voltage cells. The device is implemented by using operational amplifiers and switching circuitry is provided by transistors. The device can be utilized in battery powered electric vehicles to prevent galvanic cell damage and also in series connected fuel cells to prevent fuel cell damage.
May 20, 1981
Bobbett, R. E.; McCormick, J. B. & Kerwin, W. J.
An improved process for solvent extraction of organic matter from shale by two extraction steps in sequence. The extraction steps are: (1) treating a kerogen-containing shale with a solvent system comprising a combination of water and an alcohol at a temperature of about 375 to 425/sup 0/C; and (2) treating the product of (1) with a solvent system comprising a combination of an alcohol and another organic solvent at an elevated temperature, but not above about 425/sup 0/C. The organic matter is recovered by separating the liquid which results from step (2) from the shale solids.
Patent for a fertilizer-distributer with "means for agitating and loosening up the fertilizing material and delivering the same through a series of discharge-openings, such series extending transversely of the path of movement of the machine across the field and controlled by individual and independently-operable feed slides or gates, whereby the machine may be used for simultaneously fertilizing adjoined furrows or as a broadcast fertilizer-distributer" (Lines 12-21).