| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 15 | |
| #2 | Austria | 1 | |
| #3 | Switzerland | 1 | |
| #4 | Germany | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Measurement | |
| #3 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Optical systems | |
| #2 | Measuring distances | |
| #3 | Goods for writing upon | |
| #4 | Radio navigation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Locquin Marcel | 6 |
| #2 | Victor Locquin Marcel | 1 |
| #3 | Wild Societe Anonyme De Vente | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2687670A | Optical device with a variable and colored phase contrast | |
| GB715752A | Improvements in phase-contrast microscopy |