Non-rotating plug set
US4858687A · kind A · utility
64Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Nov 2, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/167
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The plug set of the present invention comprises an upper plug having a non-rotation insert retained therein and a lower plug having two non-rotation inserts retained therein. The present invention further includes the use of a non-rotation insert in the floating equipment with which the plug set of the present invention is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.