| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 15 | |
| #2 | United Kingdom | 5 | |
| #3 | Germany | 4 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Preheating for stem generation | |
| #2 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Paul Dugelay | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB422999A | Improvements in and relating to feed water heaters | |
| US1816518A | Feed water heater | |
| GB332885A | Feed water heater | |
| GB302164A | Improvements in feed water heaters | |
| GB276933A | Improvements in feed water heaters | |
| GB278267A | Improvements in feed water heaters |