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公开(公告)号：US1801382A
公开(公告)日：1931-04-21
申请号：US30038128
申请日：1928-08-17
Applicant: STANDARD IG CO
Inventor： RUDOLF WIETZEL , KURT FISCHER
IPC: B01J23/78 , B01J23/847 , B01J23/89
CPC classification number: B01J23/78 , B01J23/8472 , B01J23/8946 , Y10S585/943
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