Pumping apparatus
US3981620A · kind A · utility
26Cited by
14References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1973 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Nov 19, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/328
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed in each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.