E21D 15/42
With special parts to influence the friction
Official title: with special parts to influence the friction
E21D15/42 (With special parts to influence the friction) appears on 3 US grants and 0 published applications in this corpus.
Search patents in E21D- Granted patents
- 3
- Published applications
- 0
- Assignees
- 1
- Inventors
- 3
- Latest grant
- 9 Feb 1999
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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Most cited
By later US patents