Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8979138 | Pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2015-03-17 |
| RE45304 | Pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2014-12-30 |
| 8517430 | Pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2013-08-27 |
| 8312616 | Method of using a pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2012-11-20 |
| 8177263 | Pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2012-05-15 |
| 7950701 | Pipe coupling having movable gripping bodies | Douglas R. Dole, Michael V. Porter | 2011-05-31 |
| D611126 | Reversed V-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-03-02 |
| D609312 | Reversed v-interface coupling | Michael V. Porter, William A. Nagle | 2010-02-02 |
| D608870 | V-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D608868 | V-interface coupling | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D608869 | V-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D608871 | V-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D608872 | Reversed V-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D608873 | Reversed v-interface coupling segment | Michael V. Porter, William A. Nagle | 2010-01-26 |
| D605736 | Reversed v-interface coupling | Michael V. Porter, William A. Nagle | 2009-12-08 |
| D600325 | V-interface coupling | Michael V. Porter, William A. Nagle | 2009-09-15 |
| 6422535 | Knife gate valve | Jon Terence Stone, Douglas R. Dole | 2002-07-23 |