| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Australia | 1 | |
| #2 | Brazil | 1 | |
| #3 | Canada | 1 | |
| #4 | German Democratic Republic | 1 | |
| #5 | Germany | 1 | |
| #6 | Denmark | 1 | |
| #7 | Finland | 1 | |
| #8 | United Kingdom | 1 | |
| #9 | Greece | 1 | |
| #10 | Luxembourg | 1 | |
| #11 | Netherlands | 1 | |
| #12 | United States | 1 | |
| #13 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Optical systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gregorio Pietrangelo | 9 |
| #2 | Pietrangelo Gregorio | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GR900100253A | Universal stereoscopic viewer based principle of optical convergency | |
| ZA9002524B | Universal stereoscopic viewer based on a new principle of optical convergency |