Method and apparatus for verifying whether documents have been separated from an opened envelope
US5655668A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S209/90
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method and apparatus for checking whether documents have been separated from an opened envelope includes conveying an envelope past an input transducer which measures a characteristic, based on light shown through the envelope, of each individual envelope along a measuring path parallel to the direction of movement of the envelope. From the measured characteristic, a value profile is determined, from which a reference value for each envelope is determined. The value profile is used then to calculate an extreme limit value for each envelope. An envelope-suspect signal is generated if the value profile lies beyond the limit value over a specified minimum substantially continuous measuring distance. The system calculates the values for each envelope, and accordingly, envelopes of greatly diverse characteristics may be reliably checked in random order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.