Calibrating means for a microdispenser
US4063662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1976 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Jul 8, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F11/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Calibrating means for a microdispenser of the type wherein a plunger is operable to automatically draw a fixed volume of fluid into, and expel the liquid from, a precision capillary tube. The calibrating means includes a graduation marking on the capillary tube indicating the precise, predetermined quantity of fluid to be drawn into the tube. Calibration is effected by varying the degree of engagement of the microdispenser end cap with the microdispenser barrel, which effects corresponding longitudinal movement of the plunger with respect to the capillary tube until the outer terminal thereof is aligned with the graduation marking on the capillary tube. Friction means are provided for preventing accidental movement of the end cap after the calibration adjustment has been made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.