| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Belgium | 2 | |
| #2 | Germany | 2 | |
| #3 | Netherlands | 2 | |
| #4 | Switzerland | 1 | |
| #5 | Denmark | 1 | |
| #6 | France | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Measuring temperature |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kooiman Pieter Leendert | 4 |
| #2 | De Graaff Johannes Dirk | 3 |
| #3 | Graaf Johannes Dirk De | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE955638C | Heat meter | |
| GB732872A | Improvements in or relating to calorimeters for measuring the amount of heat given out or absorbed by a flowing medium |