Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D665060 | Pipe coupling segment | Charles E. Wilk, Jr., Douglas R. Dole, Scott D. Madara | 2012-08-07 |
| D665061 | Pipe coupling segment | Douglas R. Dole, Scott D. Madara, Charles E. Wilk, Jr. | 2012-08-07 |
| 7996981 | Method of joining pipes in end to end relation | Douglas R. Dole | 2011-08-16 |
| D524427 | Pipe coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-07-04 |
| D523123 | Elbow coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-06-13 |
| D517665 | Pipe coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-03-21 |
| D517666 | Elbow coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-03-21 |
| D517176 | Tee coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-03-14 |
| D516686 | Tee coupling | Charles E. Wilk, Jr., Jianyong Sun | 2006-03-07 |