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.)
HAROLD L SHAFFER
WILLIAM D MACMILLAN
Original Assignee
HAROLD L SHAFFER
WILLIAM D MACMILLAN
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HAROLD L SHAFFER, WILLIAM D MACMILLANfiledCriticalHAROLD L SHAFFER
Priority to CA120492ApriorityCriticalpatent/CA925821A/en
Application grantedgrantedCritical
Publication of CA925821ApublicationCriticalpatent/CA925821A/en