Monitoring sheet material
US4718026A · kind A · utility
8Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1984 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | May 25, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/86
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Inorganic constituents of cigarette paper are identified and monitored by scanning a region of the infra red spectrum of the paper, computing first and second order derivatives of the scan, comparing the first and second order derivatives by a best fit comparison with reference spectral data, and computing concentrations in the paper of the identified inorganic constituents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.