Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7223447 | Method of coating welded tubes | Theodore H. Krengel | 2007-05-29 |
| 6018859 | Method of forming seamed metal tube | John J. Borzym, Theodore H. Krengel, Charles A. Willetts, Edward Wiesenthal, III | 2000-02-01 |
| 5915421 | Method of forming seamed metal tube | John J. Borzym, Theodore H. Krengel, Charles A. Willetts, Edward Wiesenthal, III | 1999-06-29 |
| 5732874 | Method of forming seamed metal tube | John J. Borzym, Theodore H. Krengel, Charles A. Willetts, Edward Wiesenthal, III | 1998-03-31 |