Scannable form having a control mark column with encoded data marks
CA 2070635 C · Owner: Clark, Jay V. · Inventors: Clark, Jay V.; Mcmillin, John V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A scannable form (10) 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 (12) 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 (14). The data information is encoded using data marks (20) 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.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 4, 1990 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.