Double pump device for mixing two or more liquids with variable relative ratios and concentrations
US3935971A · kind A · utility
38Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | May 23, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45722
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A double pump device for mixing with variable ratios and concentrations two or more liquids, comprising in combination: a first peristaltic pump, and a second peristaltic pump, each of said pumps acting on a plurality of collapsible tubes, said pumps being operated by two electric motors, interdependant and preferably identical to each other, driven by an electronic circuit comprising as main elements a differential amplifier and circuitry means for adjusting the input voltage of the differential amplifier and for amplifying the output signals from the differential amplifier before their application to the two driving motors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.