Light blocking lens for welder helmet
US4373212A · kind A · utility
7Cited by
8References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Nov 12, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F9/065
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In the sight opening of the face shield of a welding helmet, a protective lens overlying a filter lens and having a light impervious coating about its edge portion blocking the passage of light rays through its edge portion and through the clearance about the lenses within the sight opening and thus eliminating the use of a gasket or other sealant about the lens first mentioned or within or about the sight opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.