| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 11 | |
| #2 | United States | 10 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Engines, pumps and turbines | |
| #4 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies | |
| #3 | Refrigerators | |
| #4 | Unspecified technologies | |
| #5 | Pumps | |
| #6 | Pipes | |
| #7 | Rotary-pistons | |
| #8 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Vollmann Carl W | 21 |
| Publication | Filing date | Title |
|---|---|---|
| US2143637A | Refrigerating system | |
| US1838165A | Refrigerating apparatus | |
| US1669637A | Refrigerator | |
| US1626768A | Rotary compressor | |
| US1627680A | Valve for gas compressors | |
| US1632155A | Gas compressor | |
| US1632385A | Compressor | |
| US1451723A | Compressor | |
| US1301987A | Gas-compressor. | |
| US1258166A | Pipe coupling or joint. | |
| CA288039A | Refrigerating system | |
| CA244178A | Compressor | |
| CA361066A | Food freezing method | |
| CA377503A | Refrigerating system | |
| CA327409A | Refrigerating apparatus | |
| CA277312A | Refrigerator | |
| CA391913A | Pipe fin attachment | |
| CA269947A | Rotary compressor | |
| CA272135A | Refrigerant controller | |
| CA365166A | Compressor stuffing box |