E.i. Dupont De Nemours and Company

Joseph Herbert Mason

Mark Allan Lamontia

Barbara Klimowicz O'Rourke

An improved pressure vessel comprising a polymer inner bladder inside a containment envelope is provided which is well-suited for transporting hazardous materials therewithin via air transport. The improved pressure vessel features a seal placed over the closure of the containment envelope which has been found to suppress failure of the pressure vessel by creep which occurs as a result of the high internal pressure that the pressure vessel experiences at high altitudes. The seal also serves to indicate whether or not the containment envelope has been tampered with after having been sealed.

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Newark, DE, United States of America

Joseph Herbert Mason