| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 24 | |
| #2 | Germany | 6 | |
| #3 | Denmark | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Machine tools | |
| #3 | Measurement | |
| #4 | Machines | |
| #5 | Audio-visual technology | |
| #6 | Computer technology |
| # | Technology | |
|---|---|---|
| #1 | Optical systems | |
| #2 | Grinding or polishing devices | |
| #3 | Grinding tools | |
| #4 | Measuring length, angles and areas | |
| #5 | Unspecified technologies | |
| #6 | Cameras | |
| #7 | Accessories for machine tools | |
| #8 | Television | |
| #9 | Data recognition and presentation | |
| #10 | Measuring volume |
| # | Name | Total Patents |
|---|---|---|
| #1 | Chapman Alan | 2 |
| #2 | Spragg Robert Claude | 1 |
| #3 | Henry Cook Gordon | 1 |
| #4 | Cook Gordon Henry | 1 |
| #5 | Rawstrone George Ormerod | 1 |
| #6 | Rawstron Georg Drmerod | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1270392B | Lens with changeable focal length and image size | |
| DE1270391B | Lens with changeable focal length and image size | |
| FR1267355A | Enhancements to variable focal length lenses | |
| DE1235180B | Blocking and adjusting device for fixing a lens |