Hecla Mining Company (HL)
Patents
US patents through Dec 31, 2025 · PatentsView, from the USPTO’s Open Data Portal · read Oct 27, 20263 patents granted to the 2 names below, as the owner printed on each patent when it was granted. A later sale, a lapse or an expiry is not read, so this is what was granted to Hecla Mining Company’s names, not what it holds today.
0 published
1 published
Names not counted (1)
| Granted | Patent | Title | Field | Owner as printed |
|---|---|---|---|---|
| Oct 17, 2023 | 11,788,411 | Systems and methods of underhand closed bench mining | Civil engineering | HECLA MINING COMPANY |
| Apr 4, 1989 | 4,818,025 | Narrow opening mechanical miner | Civil engineering | HECLA MINING COMPANY |
| Jun 8, 1976 | 3,961,941 | Method of producing metallic lead and silver from their sulfides | Materials, metallurgy | HECLA MINING COMPANY |
| Published | Application | Title | Field | Owner as printed |
|---|---|---|---|---|
| Apr 27, 2023 | 2023/0126105 | SYSTEMS AND METHODS OF UNDERHAND CLOSED BENCH MINING | Civil engineering | Hecla Mining Company · patent 11,788,411 granted from it |
A patent is counted where the owner printed on it when it was granted carries the company’s own name, a former name, the name of a subsidiary its annual report lists, or its own name with a patent-holding phrase (Technology Licensing, Intellectual Property and the like), once the legal form, case and punctuation are set aside, and prints a country that name counts in. PatentsView’s data are published under the Creative Commons Attribution 4.0 licence. Source: PatentsView's granted patents and pre-grant publications, disambiguated, from the USPTO's Open Data Portal, through Dec 31, 2025, read Oct 27, 2026.