Anordnung um Rohrkupplungen vor Korrosion zu schützen
WP 60 2008 031 714.5 – C23F 11/00. AT 25.04.2008; OT 06.11.2008; PT 23.04.2014. Anm.: Northern Technologies International Corp., Beachwood, US; Petroléo Brasileiro S.A., Rio de Janeiro, BR. Erf.: Lyublinski, Efim Ya, Solon, Ohio 44139, US, Shultz, Marcelo, Rio de Janeiro RJ, BR, Uemura, Keiji, Hyogo 659-0012, JP, Vaks, Yefim, South Euclid, Ohio 44118, US.