Method for covering ultraviolet sources
US4381136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1981 |
| Grant date | Apr 26, 1983 |
| Priority date | — |
| Expiry date | Mar 3, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/0667
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Disclosed is a method for covering a source emitting ultraviolet radiation which method comprises covering said source with an acrylic glass colored with a coloring agent which absorbs in the visible region of the spectrum between 400 nanometers and 550 nanometers and exhibits an absorption of at least 2 percent for any wavelength within this region, and which agent concurrently has an average degree of transmission in the A- and B-region of the ultraviolet spectrum which is not below 55 percent and is not less than 10 percent at any wavelength in this region, said agent being present at a concentration equivalent to 0.0005 to 0.3 percent by weight in a layer, one millimeter thick, of a radiation absorbing matrix. Also disclosed are colored acrylic glass covers for use in such a method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.