Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5215245 | Method for roll embossing metal strip | — | 1993-06-01 |
| 4995252 | Method and apparatus for internally enhancing heat exchanger tubing | Gerald F. Robertson, John R. McManus | 1991-02-26 |
| 4858305 | Single station tension hairpin tube expander | Kenneth P. Gray, Michael L. McDonough, Bruce J. Poplawski, Daniel P. Gaffaney | 1989-08-22 |
| 4421972 | Pulsed direct current arc welding | John Richard Duncan, Roderick G. Rohrberg, William E. Wright, Sr. | 1983-12-20 |
| 4402240 | Heat exchanger ribbon slitting device and method | — | 1983-09-06 |
| 4403135 | Pulse width modulated pulsed DC arc welding | Dale Jackson | 1983-09-06 |
| 4253225 | Method of manufacturing a heat exchanger element | William E. Wright | 1981-03-03 |