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
CA234,000A
Inventor
Yoshikiyo Fukushima
Shigeru Watanabe
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.)
NIKKAI GIKEN CO
Nippon Concrete Industries Co Ltd
Original Assignee
NIKKAI GIKEN CO
Nippon Concrete Industries Co Ltd
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 NIKKAI GIKEN CO, Nippon Concrete Industries Co LtdfiledCriticalNIKKAI GIKEN CO
Priority to CA234,000ApriorityCriticalpatent/CA1021584A/en
Application grantedgrantedCritical
Publication of CA1021584ApublicationCriticalpatent/CA1021584A/en