Liquid dispenser
US3986645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | May 28, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/287
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A liquid dispenser in the form of a syringe having a barrel, with a piston valve/seal slidable in the barrel bore and having a preformed liquid passage hole extending through a slidable elastic main body thereof in which an elastic hour-glass shaped plug seal is removably disposed. A rearwardly extending post fixed on the forward end wall of the barrel bore effects rearward knockout removal of the plug seal from the preformed hole as a function of forward sliding movement of the piston valve/seal in the bore, and a liquid flow passage is formed in the post to enable passage of liquid therepast. The piston valve/seal main body has a plug-containment chamber which is larger than the plug and enables by-pass liquid flow past the plug after dislodgment of the plug into this chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.