Method and apparatus for erecting a drilling rig
US-9650840-B2 · May 16, 2017 · US
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Cai Robert patents
Cai Robert is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Cai Robert |
| Total patents | 2 |
| First publication | Oct 27, 2016 |
| Latest publication | May 16, 2017 |
Notable patents
Publications ranked by popularity score, then publication date.
Method and apparatus for erecting a drilling rig
US-2016312543-A1 · Oct 27, 2016 · US
Recent patents
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Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| Nat Oilwell Varco Lp | 3 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| E21B7/02 | 2 |
| E21B15/003 | 2 |
| E04H12/345 | 2 |
| E04H12/00 | 2 |
| E21B15/00 | 2 |