> [ On 1963/08/09 Union Carbide Corp. was granted copyright on the
> [ trademark "Perflex", a "Plastic Film and Sheeting for Use as
> [ Wrapping and Packaging Material."

Perflex is a trade name encompassing many products still available.
Uses today, apart from food services industries, include the continued
use of Perflex in water filters and the use of other Perflex products
in satellites.

I think the stories of Perflex as water containers confuses the plastic
film with Polylon.

The only "military" use I have been able to confirm of Perflex is here:

  http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0703332 

Wm. G. Chapman - Curator of Organs
United States Military Academy
West Point, New York