Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348089 | Method and apparatus for the multiple stage cementing of a casing string in a well | John T. Brandell, Alan B. Duell | 1994-09-20 |
| 5314015 | Stage cementer and inflation packer apparatus | Steven G. Streich, John T. Brandell, Richard L. Giroux | 1994-05-24 |