INTERNATIONAL SEARCH REPORT International application No PCT/US2020/024198 Information on patent family members Patent document Publication Patent family Publication cited in search report date member(s) date US 3655619 A 11-04-1972 NONE GB 1150508 A 30-04-1969 DE 1719272 A1 12-08-1971 GB 1150508 A 30-04-1969 US 5059670 22-10-1991 CA 2039677 A1 28-10-1991 EP 0454446 A1 30-10-1991 J P H04227716 A 17-08-1992 US 5059670 A 22-10-1991