| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 4 | |
| #2 | Belgium | 1 | |
| #3 | Denmark | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | Spain | 1 | |
| #6 | Greece | 1 | |
| #7 | Ireland | 1 | |
| #8 | Italy | 1 | |
| #9 | Portugal | 1 | |
| #10 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Indexing scheme relating to hinges | |
| #2 | Doors and windows | |
| #3 | Hinges for doors or windows | |
| #4 | Wing fittings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Calvert E F | 2 |
| #2 | Calvert Eric Frederick | 2 |
| #3 | Calvert Eric F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4561483A | Guide track for a folding barrier | |
| GB8318449D0 | Picket for folding barrier | |
| IE802585L | Overhead door | |
| EP0037448A1 | Closure structures | |
| GB2072248A | Roller shutters | |
| GB2039595A | Closure structures | |
| GB1572215A | Closure arrangement |