Drilling head
US4526243A · kind A · utility
75Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1981 |
| Grant date | Jul 2, 1985 |
| Priority date | — |
| Expiry date | Nov 23, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Drilling head incorporating downwardly facing lip type bearing seals, stationary seal cartridge for head seal, rotating replaceable seal bushing for head seal, and optional screw connection for removable side outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.