| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Chemical engineering | |
| #3 | Packaging and shipping | |
| #4 | Engines, pumps and turbines | |
| #5 | Thermal processes | |
| #6 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Non-metallic elements | |
| #2 | Metal production and refining | |
| #3 | Separation | |
| #4 | Non-positive-displacement pumps | |
| #5 | Furnaces | |
| #6 | Transport or storage devices | |
| #7 | General building constructions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heinz Nicholas L | 11 |
| #2 | Geib John W | 1 |
| #3 | Freeland William H | 1 |
| #4 | Chase March F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1277923A | Building construction. | |
| US1277922A | Concentrating apparatus. | |
| US1160077A | Device for removing residue from retorts. | |
| US986709A | Furnace for roasting ores. | |
| US1057149A | Manufacture of sulfuric acid. | |
| US898410A | Recuperative furnace. | |
| US898409A | Recuperative spelter-furnace. | |
| US887194A | Regenerative furnace. | |
| US875909A | Manufacture of sulfuric acid. | |
| US798100A | Fan-case for acid-flues. | |
| US728914A | Apparatus for making sulfuric acid. |