| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | France | 3 | |
| #3 | Canada | 2 | |
| #4 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication | |
| #2 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kurman Nathan A | 5 |
| #2 | Kurman Nathan Albert | 1 |
| #3 | Timmons John S | 1 |
| #4 | Giselman Marshall W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB223981A | Improvements in or relating to telephonic systems | |
| GB138530A | Improvements in or relating to telephone systems | |
| US1412982A | Casing for telephone sets | |
| US1584949A | Telephone system | |
| US1529427A | Telephone reproducer | |
| US1356156A | Telephonic receiver | |
| US1201060A | Sound transmitting and reproducing unit. | |
| CA174537A | Telephone paging system | |
| US1239607A | Telephonic paging system. | |
| CA196936A | System of telephone circuits |