Transparent laboratory slide for examination of liquid specimens
US4299441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1979 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | May 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved transparent slide, and method of manufacture, the slide having a plurality of covered chambers defined between generally parallel and uniformly spaced sidewalls integral to the slide and having a channeled configuration for inducing a liquid specimen into the chambers, wherein the size of the chamber and the thickness of the side walls is significantly reduced from prior structures. An improved molding method adapted for producing the thinner slide sidewalls, the method including the use of a plurality of injection ports for delivering molten plastic to a mold and locating of a plurality of symmetrical dams in the mold that act to uniformly distribute and improve the flow of molten plastic near chamber forming portions of the mold. In accordance with one embodiment of the present invention, the upper surface of the slide has a frosted surface portion suitable for writing upon and has a plurality of small protrusions from the surface for ensuring adequate spacing from adjacent slides, when multiple slides are packaged together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.