Scannable form having a control mark column with encoded data marks
US5184003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1992 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Jan 24, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A scannable form for use in an optical mark reading system has a timing track that is pre-encoded with data information known or determined prior to a respondent completing the scannable form. The data information is pre-encoded in the control mark column on the scannable form by utilizing that portion of the control mark column that is not essential for conveying the scan control information associated with the scan control marks. The data information is encoded using data marks that represent the data information in a binary or other similar coding technique. The data marks are column-aligned with the scan control marks in the control mark column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.