Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4552335 | Ball valve | William H. Alexander | 1985-11-12 |
| 4449695 | Fire safe plug valve | William H. Alexander | 1984-05-22 |
| 4258743 | Expanding gate valve having mechanically secured seats | Robert C. Houlgrave, William S. Shelton | 1981-03-31 |
| 4215749 | Gate valve for shearing workover lines to permit shutting in of a well | Jeff L. Merten | 1980-08-05 |