Low temperature vapor phase digestion of graphite
US9623371B1 · kind B1 · utility
0Cited by
17References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2015 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Sep 30, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for digestion and gasification of graphite for removal from an underlying surface is described. The method can be utilized to remove graphite remnants of a formation process from the formed metal piece in a cleaning process. The method can be particularly beneficial in cleaning castings formed with graphite molding materials. The method can utilize vaporous nitric acid (HNO3) or vaporous HNO3 with air/oxygen to digest the graphite at conditions that can avoid damage to the underlying surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.