Method and apparatus for testing air filters and the like
US4279508A · kind A · utility
8Cited by
3References
13Claims
0Family size
Inventor
Key dates
| Filing date | Jun 29, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Jun 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/88
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for testing paper air filters and the like for leaks or holes comprises an arrangement for positioning an electric lamp on one side of the filter to provide a bright light and inspecting the filter for holes by observing it from the opposite side. A motor is provided for moving the light to selected positions along the filter. The inspection of the filter is effected by use of an electronic light image intensifier which makes possible the quick and reliable detection of very small holes in the paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.