| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | Austria | 3 | |
| #3 | France | 2 | |
| #4 | Switzerland | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Organic fine chemistry | |
| #2 | Pharmaceuticals | |
| #3 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Acyclic or carbocyclic compounds | |
| #2 | Medical preparations | |
| #3 | Compounds containing metals | |
| #4 | Heterocyclic compounds |
| # | Name | Total Patents |
|---|---|---|
| #1 | Opfermann Adolf Christian Jose | 2 |
| #2 | Opfermann Adolf | 1 |
| #3 | Sohn Johann G W Opfermann | 1 |
| #4 | Josef Opfermann Adolf Christia | 1 |
| #5 | Opfermann Adolf Dipl-Chem | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2621201A | Manufacture of ferro-calcium-citrate |