Methods and means for detection of dangerous substances
US5142144A · kind A · utility
5Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1990 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Jul 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/642
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The presence of dangerous substances such as cocaine is detected by atmospheric samples that include the residues (such as ether) of the manufacture of the suspected substances into a gas chromatograph to remove substances other than the residues and thereafter drawing them into a proportional counter chamber having a high voltage and a signal wire. A laser passes light capable of exciting the suspected residues through the proportional counter to produce ionization and generate a photoelectron. The signal wire passes this to an analyzer which indicates the presence of the suspected residues.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.