| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 3 | |
| #2 | France | 3 | |
| #3 | Belgium | 2 | |
| #4 | Germany | 2 | |
| #5 | United States | 2 | |
| #6 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Machine tools | |
| #3 | Mechanical elements | |
| #4 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Punching metal | |
| #2 | Heat-exchange device details | |
| #3 | Pipes | |
| #4 | Heat-exchanger without contact | |
| #5 | Fluid heaters | |
| #6 | Air-conditioning | |
| #7 | Special electric heating or lighting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ralph Dunning Cooksley | 1 |
| #2 | Bunnell Theodore R | 1 |
| #3 | D Onofrio M | 1 |
| #4 | Robert Bunnell Theodore | 1 |
| #5 | Gravlin H E | 1 |
| #6 | Cooksley R | 1 |
| #7 | Harry Eugene Gravlin | 1 |
| #8 | Theodore Robert Bunnell | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3730229A | Tubing unit with helically corrugated tube and method for making same | |
| FR2074687A1 | Instantaneous heat exchanger specially used as a water heater | |
| US3533267A | Method and machine for spirally corrugating tubes |