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
CA621473A
Inventor
Sprague Frank
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.)
ELECTRO-STATIC AIR FILTER MANUFACTURING Corp
Original Assignee
ELECTRO-STATIC AIR FILTER MANUFACTURING Corp
Publication date
Application grantedgrantedCritical
Publication of CA621473ApublicationCriticalpatent/CA621473A/en