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
CA904097A
Inventor
E. Frost Ruben
R. Sytsma Frederick
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.)
CL Frost and Son Inc
Original Assignee
Frederick R Sytsma
Ruben E Frost
CL Frost and Son Inc
Publication date
Application grantedgrantedCritical
Publication of CA904097ApublicationCriticalpatent/CA904097A/en