Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/768,886external-prioritypatent/US4816543A/en
Application filed by Air Prod & ChemfiledCriticalAir Prod & Chem
Application grantedgrantedCritical
Publication of ATE43616T1publicationCriticalpatent/ATE43616T1/de