| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 6 | |
| #2 | United Kingdom | 5 | |
| #3 | United States | 4 | |
| #4 | Germany | 3 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Engines, pumps and turbines | |
| #3 | Environmental technology | |
| #4 | Mechanical elements | |
| #5 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Steam generation | |
| #2 | Casings for combustion chambers | |
| #3 | Siphons | |
| #4 | Combustion residues removal | |
| #5 | Pipes | |
| #6 | Details of furnaces | |
| #7 | Superheating of steam | |
| #8 | Pumps | |
| #9 | Optical systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Duquenne Camille | 6 |
| #2 | Camille Duquenne | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB400060A | Improvements in and relating to pipe unions | |
| US1624481A | Steam generator | |
| GB263681A | Improvements in or relating to tubular steam generators | |
| US1693597A | Pulverulent-fuel furnace | |
| GB241885A | Improvements in furnaces for boilers or the like which are heated by powdered fuel | |
| US1683963A | Furn ce arch | |
| GB214970A | Suspended roof of refractory material for furnaces | |
| GB156091A | Improvements in steam generators | |
| US1411880A | Boiler |