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公开(公告)号：US3001868A
公开(公告)日：1961-09-26
申请号：US71402158
申请日：1958-02-10
Applicant: NAT RES DEV
Inventor： JOHN AVESTON , ANTHONY EVEREST DAVID , ALFRED WELLS RONALD
CPC classification number: C22B3/42 , Y02P10/234
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公开(公告)号：US2753258A
公开(公告)日：1956-07-03
申请号：US33211653
申请日：1953-01-19
Applicant: NAT RES DEV
Inventor： HEREWARD BURSTALL FRANCIS , JOAN FORREST PHYLLIS , FRANK KEMBER NORMAN , ALFRED WELLS RONALD
IPC: C01G7/00
CPC classification number: C01G7/003 , C22B3/24 , C22B3/42 , Y02P10/234
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