| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Germany | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Sound-producing devices | |
| #2 | Special information storage | |
| #3 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Elwood Grissinger | 6 |
| #2 | Grissinger Elwood | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2013953A | Loud speaker attachment | |
| GB229800A | Improvements in or relating to phonographic sound-boxes | |
| US1666058A | Sound projector | |
| GB228971A | Improvements in and relating to vibration transmitting devices | |
| US1666057A | Sound-projecting apparatus | |
| US1628242A | Sound-vibration-translating device | |
| US1477556A | Sound-projecting apparatus and method | |
| US1553770A | Apparatus for reproducing, amplifying, and projecting sound waves |