Tubular article
US4868967A · kind A · utility
40Cited by
30References
77Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1987 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Mar 2, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53657
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A double-walled article in the form of a tube having a small volume filling of a friction-reducing liquid or solid between its two walls. The article is able to revolve over a substrate by relative sliding motion between its two walls, to provide environmental or electrical protection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.