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 US06/808,784external-prioritypatent/US4657564A/en
Application filed by Air Prod & ChemfiledCriticalAir Prod & Chem
Publication of IN168778BpublicationCriticalpatent/IN168778B/en