Enhanced leak detection dye carrier
US7552623B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2004 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | May 11, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S252/964
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A leak detection dye carrier is formed using a two-stage process (53). In a first stage, the dye carrier (52) is saturated with a mixture (54) of a dye powder and an evaporable solvent, such as alcohol. The solvent is permitted to evaporate leaving dispersed dye solids (56) on the dye carrier (52). In a second stage, the dye carrier (52) and dispersed dye solids (56) are immersed in a wet bath (58). The method may be a hybrid of dry and wet systems of placing dye onto a substrate carrier in which the wet bath is a mixture of a dye and a solvent, such as a system lubricant. Alternatively, the immersion of the dye carrier in the second stage may be limited in duration to prevent the dye solids in the first stage from being dissolved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.