Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robbins and Myers Inc
Original Assignee
Sheldon S L Chang
Robbins and Myers Inc
Publication date
Application grantedgrantedCritical
Publication of CA486422ApublicationCriticalpatent/CA486422A/fr