Assignee
HECLA MINING CO
US·3 granted patents·24 citations·filing 1975–2021
Top patents by PatentIndex Score
3 records- 0158US3961941AMethod of producing metallic lead and silver from their sulfidesHECLA MINING CO·Filed 1975·Granted Jun 8, 1976·12 cites·12 claims
- 0240US11788411B2Systems and methods of underhand closed bench miningHECLA MINING CO·Filed 2021·Granted Oct 17, 2023·0 cites·18 claims
- 0331US4818025ANarrow opening mechanical minerHECLA MINING CO·Filed 1986·Granted Apr 4, 1989·12 cites·12 claims
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