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Priority claimed from US06/248,023external-prioritypatent/US4409032A/en
Priority claimed from CA000395820Aexternal-prioritypatent/CA1201115A/en
Application filed by Thermoform Bau ForschungfiledCriticalThermoform Bau Forschung
Priority claimed from EP19820900956external-prioritypatent/EP0074983B1/de
Application grantedgrantedCritical
Publication of ATE23364T1publicationCriticalpatent/ATE23364T1/de