Cementing plug
US4706747A · kind A · utility
24Cited by
15References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Nov 25, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wellbore plug having a wiper disposed in inverted position which, in one embodiment, reinforces a conventionally disposed wiper of the plug. A plug wiper is provided which has a conventional cone-shaped portion and an opposing reinforcing portion, cone-shaped or otherwise. A plug wiper is provided which has no threads for mating with other parts of the plug, but which has a hollow recess for emplacing the wiper on a plug shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.