| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 3 | |
| #2 | Germany | 2 | |
| #3 | France | 2 | |
| #4 | Japan | 2 | |
| #5 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Installation of electric cables | |
| #2 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Happer George Taylor | 3 |
| #2 | Jiyooji Teiraa Hatsupaa | 2 |
| #3 | Happer George T | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB2077797A | Ducting | |
| US4269231A | Below surface ducting | |
| US4286630A | Surface ducting | |
| GB2026781A | Below surface ducting | |
| GB2026254A | Surface ducting |