INPADOC Patent Family US4428535 (Original INPADOC file)
Publication No. Publication date Filing No. Priority Status Source Data
US 4428535A 1984-01-31 US 28088281A 19810706 US 28088281A 19810706 Expired National register (PAIR)

INPADOC Legal Status 
US4428535 (Expired)
1996-04-09  -EXPIRED DUE TO FAILURE TO PAY MAINTENANCE FEE Effective DATE
             19960131