| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 3 | |
| #2 | Denmark | 2 | |
| #3 | Spain | 2 | |
| #4 | Austria | 1 | |
| #5 | Canada | 1 | |
| #6 | Switzerland | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Building materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mack Ludwig | 9 |
| Publication | Filing date | Title |
|---|---|---|
| CA83098A | Calcined gypsum | |
| US776076A | Manufacture of compositions from calcined gypsum. | |
| GB190312584A | The Manufacture of a Composition from Calcined Gypsum | |
| GB189612425A | Proceeding for the Production of Quick-setting (Hardening) Mortar of Hydraulic Gypsum. | |
| GB189414846A | Improvements relating to the Manufacture of Cement from Schist and Bituminous Marl. |