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.)
Expired
Application number
CA699162A
Inventor
Irving Levi
John W. R. Weed
Original Assignee
Charles E Frosst and Co
Publication date
Application grantedgrantedCritical
Publication of CA699162ApublicationCriticalpatent/CA699162A/en