| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 4 | |
| #2 | United Kingdom | 4 | |
| #3 | Austria | 3 | |
| #4 | Canada | 3 | |
| #5 | Switzerland | 3 | |
| #6 | Spain | 3 | |
| #7 | United States | 2 | |
| #8 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Refrigerators | |
| #2 | Pumps | |
| #3 | Steam engine plants |
| # | Name | Total Patents |
|---|---|---|
| #1 | Horst Ludwig | 19 |
| #2 | Ludwig Horst | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE863065C | Compressors for refrigeration machines | |
| ES131113A1 | A machine for color photography. | |
| CA156737A | Refrigerator | |
| GB191321245A | Improvements in Refrigerating Apparatus. | |
| US1161937A | Refrigerating apparatus. | |
| CA132959A | Motor mechanism | |
| GB191030214A | A Process for Driving Vapour Motors in which the Vapour Medium is Recovered and Liquefied. | |
| CA119656A | Carbonic acid motor | |
| US961859A | Carbonic-acid motor. | |
| GB190904576A | A Carbonic Acid Engine in which the Carbonic Acid is Heated by Electricity. | |
| GB190827251A | Process and Apparatus for Utilizing Carbonic Acid for Power Purposes. |