| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Thermal processes | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Rotary pistons | |
| #3 | Refrigerators | |
| #4 | Unspecified technologies | |
| #5 | Pumps | |
| #6 | Pistons and sealings | |
| #7 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rolaff Walter G E | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US1795445A | Reciprocating compressor | |
| US1789843A | Compressor | |
| US1796535A | Blade construction for compressors of the rotary type | |
| US1803677A | Valve controlling mechanism for refrigerating systems | |
| US1789842A | Pump or compressor | |
| US1650046A | Distributor for use in refrigerating systems | |
| US1441375A | Self-aligning support for cylinder bearings of rotary machines | |
| US1470030A | Rotary compressor | |
| US1383028A | Packing-ring for rotary shafts | |
| US1358176A | Rotary-piston packing | |
| CA198999A | Rotary piston packing | |
| CA281773A | Refrigerating compressor | |
| CA203735A | Rotary compressor |