3898023 is referenced by 5 patents and cites 13 patents.
Flat parallel plates are assembled onto a flexible pouch slack filled with fluid. The plates are lockably held but free to move expandably to a limited extent while maintaining interplate planar parallelism. The assembled plates holding the pouch are inserted into a plate retaining holder which bears yieldably against the plate outermost surfaces to accommodate the interplate planar parallel movement of the plates occasioned by subjecting the pouch and its contents while held in the assembled apparatus to rapid freezing in a cryogenic medium.
