Hand-held pipette for repetitively dispensing precise volumes of liquid
US4099548A · kind A · utility
81Cited by
1References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1976 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Aug 25, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01L3/0234
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hand-held pipette with a liquid dispensing knob at one end operably connected therewithin to a piston and piston cylinder assembly at the opposite end that is detachable from the pipette body for cleaning or replacement. An internal pawl and rack mechanism causes the piston to advance a small amount each time the knob is pressed, thereby repetitively dispensing small volumes of liquid therefrom. A second knob cooperatively engages an internal mechanism for both urging the piston to an overshoot position within the piston chamber and to disengage the piston from the internal mechanism in the pipette housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.