Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1979-05-23
1981-11-10
Henry, Jon W.
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
264 11, 26432812, 356244, G02B 2134, B29F 100
Patent
active
042994411
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.
REFERENCES:
patent: 1654369 (1927-12-01), George
patent: 3432275 (1969-03-01), Unger
patent: 3777283 (1973-12-01), Elkins
patent: 3961346 (1976-06-01), White
Henry Jon W.
ICL Scientific
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