| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 2 | |
| #2 | Poland | 2 | |
| #3 | United States | 2 | |
| #4 | Australia | 1 | |
| #5 | Canada | 1 | |
| #6 | China | 1 | |
| #7 | Germany | 1 | |
| #8 | EPO (European Patent Office) | 1 | |
| #9 | United Kingdom | 1 | |
| #10 | Malaysia | 1 | |
| #11 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering | |
| #3 | Textiles and paper | |
| #4 | Surface technology and coating |
| # | Technology | |
|---|---|---|
| #1 | Structural elements | |
| #2 | Unspecified technologies | |
| #3 | Mechanical paper working | |
| #4 | Making paper goods | |
| #5 | Layered products | |
| #6 | Shaping of plastics | |
| #7 | Certain plastics | |
| #8 | Doors and windows | |
| #9 | Producing goods from plastic |
| # | Name | Total Patents |
|---|---|---|
| #1 | Holtslag Dirk Jan | 10 |
| #2 | Krabben Henricus Johannes Mari | 6 |
| #3 | Krabben H J M | 1 |
| #4 | Holt Anthony C | 1 |
| #5 | Maria Krabben Henricus Johannes | 1 |
| #6 | Jan Holtslag Dirk | 1 |
| #7 | Holtslag D J | 1 |
| #8 | Krabben Henricus Johannes Maria | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL1008118C2 | Method of manufacturing a sandwich panel and core material therefor. | |
| NL9300503A | Method and device for manufacturing a panel. | |
| PL296462A1 | Method of making an interlayer board and apparatus therefor | |
| DE4237025A1 | Mfg. sandwich plate - comprises wetting long sides of core only for glue bonding of cover plates to retain core strength |