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
CA817248A
Inventor
R. Evensen Lester
Anthony W. Vering, Jr.
A. Lieberman David
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.)
Welch Scientific Co
Original Assignee
Welch Scientific Co
Publication date
Application grantedgrantedCritical
Publication of CA817248ApublicationCriticalpatent/CA817248A/en