| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 20 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Environmental technology | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Transport | |
| #5 | Consumer goods | |
| #6 | Chemical engineering |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gray Emmet P | 22 |
| Publication | Filing date | Title |
|---|---|---|
| US2133349A | Combined muffler and heater | |
| US2066467A | Muffler | |
| US1860892A | Muffler | |
| US1882555A | Muffler supporting device | |
| US1860146A | Muffler | |
| US1682077A | Air-cooled muffler | |
| US1619117A | Valve control | |
| US1640187A | Automobile heater cover | |
| US1598714A | Method of fastening tubing to fittings | |
| US1658766A | Conduit construction | |
| US1619116A | Automobile heater | |
| US1656629A | Muffler | |
| US1619115A | Muffler | |
| US1276209A | Muffler. | |
| US1299326A | Muffler-valve. | |
| US1035182A | Locking and releasing device. | |
| US1024683A | Whistle. | |
| US969270A | Signal-bell. | |
| US975687A | Strainer. | |
| US965178A | Check-valve. |