Drying and gas or vapor contact with solids – Material treated by electromagnetic energy – Magnetic field
Patent
1977-08-11
1978-08-08
Sebastian, Leland A.
Drying and gas or vapor contact with solids
Material treated by electromagnetic energy
Magnetic field
34 45, 34 66, F26B 1900
Patent
active
041048083
ABSTRACT:
A semi-automatic critical point drying apparatus for the preparation of biological or organic specimens for examination thereof by scanning electron microscopy. In the preparation of such specimens, the specimen is placed in a chamber into which is introduced a transitional fluid, such as liquid CO.sub.2, which replaces the dehydrating liquid in the specimen as a part of the drying process. In critical point drying, the transitional fluid in the chamber is heated to elevate the chamber temperature and pressure above the critical point of the fluid. A five-way indicator valve replaces the manually adjustable valve of prior art apparatus for enabling the operator easily to control the cooling, filling, purging and bleeding operations of such a critical point drying apparatus.
REFERENCES:
patent: 2903589 (1959-09-01), Ladd et al.
patent: 3650038 (1972-03-01), Alessi et al.
Pfefferkorn, Proceedings of the Third Annual Scanning Electron Microscope Symposium, IIT Research Institute, Chicago, Ill., Apr. 1, 1970, pp. 89 to 96.
Spicer et al., Proceedings of the Seventh Annual Scanning Electron Microscope Symposium, IIT Research Institute, Chicago, Ill., Apr. 1, 1974, pp. 299 to 304.
Horne John E.
Tousimis A. J.
Van Albert Stephen A.
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