B21F 35/006
Double-twist coil springs
Official title: {Double-twist coil springs}
B21F35/006 (Double-twist coil springs) appears on 3 US grants and 1 published applications in this corpus.
Search patents in B21F- Granted patents
- 3
- Published applications
- 1
- Assignees
- 3
- Inventors
- 6
- Latest grant
- 28 Aug 2012
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Helically-wound cable and method28 Aug 2012US 8,250,844 B2W. C. Heraeus GmbH
- Method for producing helically wound filament elements, and filament elements produced according to this method19 Dec 2000US 6,161,598 APatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
- Twist `N` curl19 Oct 1999US 5,966,811 A
Most cited
By later US patents
- Twist `N` curl11US 5,966,811 A1999
- Method for producing helically wound filament elements, and filament elements produced according to this method5US 6,161,598 APatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH · 2000
- Helically-wound cable and method2US 8,250,844 B2W. C. Heraeus GmbH · 2012