| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 | |
| #2 | United States | 6 | |
| #3 | United Kingdom | 4 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Electrical machinery and energy | |
| #3 | Materials and metallurgy | |
| #4 | Machines | |
| #5 | Transport | |
| #6 | Civil engineering | |
| #7 | Furniture and games | |
| #8 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Cameras | |
| #2 | Treatment of glass | |
| #3 | Doors and windows | |
| #4 | Electric discharge tubes | |
| #5 | Manufacturing processes | |
| #6 | Guiding railway traffic | |
| #7 | Processing photographic materials | |
| #8 | Toys | |
| #9 | Automatic musical instruments |
| # | Name | Total Patents |
|---|---|---|
| #1 | Riedel Herbert | 9 |
| #2 | Herbert Riedel | 6 |
| Publication | Filing date | Title |
|---|---|---|
| US3281976A | Transparency frames and means for loading transparencies into such frames | |
| GB1011833A | Projector screen adapted to be rolled up | |
| US3233658A | Projection screen adapted to be rolled up | |
| GB941198A | An improved collapsible stand for a flexible projection screen | |
| US3166115A | Collapsible stand for a flexible projection screen | |
| GB891228A | Diapositive frame | |
| US2931118A | Diapositive frame | |
| US2835061A | Diapositive frames |