| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Building materials | |
| #2 | Furnaces | |
| #3 | Details of furnaces |
| # | Name | Total Patents |
|---|---|---|
| #1 | Randolph Durbin Harvey | 4 |
| #2 | Ejnar Posselt | 2 |
| #3 | Thorkild Avnsoe | 2 |
| #4 | Durbin Harvey Randolph | 1 |
| #5 | Johan Norvig | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2042494A | Baffled rotary kiln | |
| US2042833A | Manufacture of portland cement | |
| US2002972A | Apparatus for making portland cement | |
| US2006386A | Manufacture of cement | |
| US2041142A | Production of cement | |
| DE506615C | Process for making improved portland cement | |
| GB290890A | Improvement in manufacture of cement | |
| US1700033A | Production of portland cement | |
| US1700032A | Production of portland cement | |
| CA281304A | Cement manufacture |