Vacuum mold and device for drilling extraction holes therein
US7988442B2 · kind B2 · utility
0Cited by
5References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 29, 2008 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jul 18, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/3788
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A vacuum mold includes a mold body with a molding surface. The mold body defines a plurality of extraction holes. Each extraction hole includes a first hole portion, a second hole portion, and a connecting portion connecting the first hole portion and second hole portion. The first hole portion is adjacent to the molding surface, and a diameter of the first hole portion is smaller than a diameter of the second hole portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.