| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Canada | 3 | |
| #3 | United Kingdom | 2 | |
| #4 | Austria | 1 | |
| #5 | Switzerland | 1 | |
| #6 | Germany | 1 | |
| #7 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Furniture and games | |
| #2 | Civil engineering | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Physical training equipment | |
| #2 | Construction of roads | |
| #3 | Swimming pools | |
| #4 | General building constructions | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hargrave Richard D | 7 |
| #2 | Vaughn George A | 6 |
| #3 | Hargrave R | 2 |
| #4 | Vaughn G | 2 |
| #5 | Vaugh George A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3935687A | Platform tennis court | |
| US3899172A | Tennis racket having improved strength factor | |
| US3805366A | Method of manufacturing a tennis racket | |
| US3745729A | Platform tennis court | |
| DE2065888A1 | Tennis racket has extruded profiled metal frame and plastics handle - the latter having a polyurethane foam core | |
| US3702701A | Metal tennis racket with plastic throat piece and molded plastic handle | |
| CA906521A | Tennis racket frame |