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 US06/857,350external-prioritypatent/US4704856A/en
Priority claimed from IN23/CAL/87Aexternal-prioritypatent/IN166706B/en
Application filed by Du PontfiledCriticalDu Pont
Priority to IN8/CAL/90ApriorityCriticalpatent/IN170307B/en
Publication of IN170307BpublicationCriticalpatent/IN170307B/en