Annular gas lift valve
US-9435180-B2 · Sep 6, 2016 · US
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Johnstone Steven patents
Johnstone Steven is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Johnstone Steven |
| Total patents | 2 |
| First publication | Apr 30, 2015 |
| Latest publication | Sep 6, 2016 |
Notable patents
Publications ranked by popularity score, then publication date.
Annular gas lift valve
US-2015114663-A1 · Apr 30, 2015 · US
Recent patents
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Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| Baker Hughes Inc | 2 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| E21B17/00 | 2 |
| E21B34/08 | 2 |
| E21B43/123 | 2 |
| E21B43/122 | 1 |