Automatic critical point drying apparatus

Details Automatic critical point drying apparatus Automatic critical point drying apparatus

1976-04-02

1977-11-01

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 66, F26B 1900

Patent

active

040559041

ABSTRACT:
A critical point drying apparatus for sample preparation in electron microscopy is automated to proceed in order through multiple operational modes in drying the specimen. These modes are: precooling, in which a specimen chamber is cooled; starting, in which the specimen chamber is filled with liquid CO.sub.2 : purging, in which a limited amount of CO.sub.2 passes through the specimen chamber; heating, in which the specimen chamber is heated to elevate pressure to the critical pressure and heat the specimen to the critical temperature; bleeding, in which the specimen chamber is depressurized to atmospheric pressure at a very slow rate; and finishing, in which the chamber is vented and an indicator signals the end of the drying operation. These steps are automatically activated in sequence when desired mode conditions are met or can be selectively controlled in a manual mode.

REFERENCES:
patent: 2903589 (1959-09-01), Ladd
patent: 3075700 (1963-01-01), Bishop, 3rd
Critical Point Drying Apparatus - Samdri Pvt 3 - Tousimis Research Corp 1975 - Operation & Service Manual.
Scanning Electron Microscopy/1970 - Electron Microscope Symposium - ITT Research Institute - Specimen Preparation Tech.

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