Boots – shoes – and leggings
Patent
1977-02-15
1977-12-13
Ruggiero, Joseph F.
Boots, shoes, and leggings
210 31C, 210198C, 235 92FL, 364497, G01N 3108, G06F 1546
Patent
active
040630773
ABSTRACT:
A controller for solvent programmer apparatus that produces programmed solvent mixtures for introduction to a liquid chromatographic analyzer. Under the direction of the controller, the solvent programmer accesses first and second solvents during a defined cycle of operation and proportions the solvents on the basis of the time within the cycle of operation that each solvent is accessed. The controller has a first counter that defines the cycle of operation and a second counter that is preset at the beginning of a cycle to a value representative of the percentage of the first solvent that is to be in a solvent mixture produced during the cycle. The second counter is then counted down. Output control logic responsive to the count states of the counters sends a command for the first solvent to be accessed upon the first counter reaching its maximum count, occurring at the beginning of a cycle, and sends a command for the second solvent to be accessed upon the second counter reaching its minimum count, with accessing of the first solvent being discontinued contemporaneously.
The value of the percentage of the first solvent is held in data storage means. In isochratic operation of the solvent programmer, the value stored remains fixed and is repeatedly loaded into the second counter. In gradient operation of the solvent programmer, a counter in the data storage means, after being preset to an initial percentage value, is counted up at some predetermined rate, with the new value stored being loaded into the second counter. The rate of change with time of the contents of the data storage means can be either linear or non-linear.
REFERENCES:
patent: 3121160 (1964-02-01), Burk
patent: 3267264 (1966-08-01), Burk et al.
patent: 3592045 (1971-07-01), Weiss
patent: 3600563 (1971-08-01), Porter et al.
patent: 3985019 (1976-10-01), Boehme et al.
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