| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 7 | |
| #2 | Canada | 3 | |
| #3 | EPO (European Patent Office) | 3 | |
| #4 | United States | 3 | |
| #5 | WIPO (World Intellectual Property Organization) | 3 | |
| #6 | China | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machine tools | |
| #3 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Swimming pools | |
| #2 | Doors and windows | |
| #3 | Scaffolding | |
| #4 | General building constructions | |
| #5 | Ladders | |
| #6 | Special furniture | |
| #7 | Workshop equipment | |
| #8 | Finishing work on buildings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Black Robert David | 20 |
| #2 | Black John Alexander | 20 |
| #3 | Alexander Black Robert David B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB201111556D0 | Retractable cover | |
| GB0914424D0 | Access panel | |
| GB0808519D0 | Retractable safety device | |
| GB0624750D0 | Adjustable height work stand | |
| GB0513379D0 | An adjustable stair enabling variation in tread angle | |
| GB0508132D0 | Ladder with treads maintained in horizontal position | |
| GB0224292D0 | Constructional unit |