Valve spring
US6371464B1 · kind B1 · utility
24Cited by
3References
50Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | May 25, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49609
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method of making a spring are described. The spring is made by etching or cutting at least one spiral arm in a flat substrate leaving residual material around the arm. The intermediate residual material is either pushed or lifted to form a conical spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.