| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Furniture and games | |
| #2 | Audio-visual technology | |
| #3 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Household appliances | |
| #2 | Optical systems | |
| #3 | Advertising |
| # | Name | Total Patents |
|---|---|---|
| #1 | Knox David M | 12 |
| Publication | Filing date | Title |
|---|---|---|
| US3041763A | Props for picture frames | |
| US3041761A | Picture display means | |
| US3041762A | Picture displays | |
| US2968108A | Picture display devices | |
| US2957262A | Picture ensemble | |
| US2966755A | Ensemble for displaying pictures and the like | |
| US2901850A | Picture holder | |
| US2881544A | Picture supporting means | |
| US2888764A | Ensemble for pictures and the like | |
| US2888765A | Holder for pictures | |
| US2657488A | Invertible and adjustable picture holder | |
| US2623316A | Variable composite picture frame |