Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5058838 | Support for variably sized electrically energized tubing | David C. Velke, Sr., Burton C. Leffingwell | 1991-10-22 |
| 4997147 | Support for electrically energized tubing | David C. Velke, Sr., Burton C. Leffingwell | 1991-03-05 |
| 4944699 | Splicing connector | David C. Velke, Sr., Burton C. Leffingwell | 1990-07-31 |
| 4874909 | Electrical splice connector | David C. Velke, Sr., Burton C. Leffingwell | 1989-10-17 |
| 4842535 | Gas tube electrode connector | David C. Velke, Sr., Burton C. Leffingwell | 1989-06-27 |