O-ring seal for rock bit bearings
US5323863A · kind A · utility
18Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/944
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A dynamic O-ring seal for retaining the lubrication around a rock bit bearing for drilling subterranean formations has a composition comprising 100 parts by weight highly-saturated nitrile elastomer, furnace black in the range of from 40 to 70 parts by weight, peroxide curing agent in the range of from 7 to 10 parts by weight, graphite in the range of from 10 to 20 parts by weight, zinc oxide or magnesium oxide in the range of from 4 to 7 parts by weight, stearic acid in the range of from 0.5 to 2 parts by weight, and sufficient plasticizer to provide a Shore hardness no more than A 80.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.