Inventor · disambiguated record

Howard E. Day

Also filed as: DAY HOWARD E

1 granted patent·12 citations·filing 1975–1975

34Inventor score

Technology areasC22B

Files withHECLA MINING CO1

Top patents by PatentIndex Score

1 record

0158US3961941AMethod of producing metallic lead and silver from their sulfidesHECLA MINING CO·Filed 1975·Granted Jun 8, 1976·12 cites·12 claims

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