IPC 2013 : D21H 21/38 : Corrosion-inhibiting agents or anti-oxidants.

IPC2013 > D > D21 > D21H > D21H 21/00 > D21H 21/38[2] > Corrosion-inhibiting agents or anti-oxidants.
D SECTION D — TEXTILES; PAPER.
D21 PAPER-MAKING; PRODUCTION OF CELLULOSE.
D21H PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR.
D21H 21/00 Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper impregnating or coating material, characterised by its function, form or properties.
D21H 21/38 · · Corrosion-inhibiting agents or anti-oxidants.