Method and apparatus for decompressing encoded data
CA 1286766 C · Owner: Linehan, Francis P. · Inventors: Linehan, Francis P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fast and flexible data decompressor decodes data such as that encoded by CCITT Group 4 facsimile machines to produce display data. In the decompressor a, microprocessor controlled by microcode evaluates variable length codes each representing a series of data cells each, data cell in a series having a single value assigned thereto. The variable length codes have a first code type such as vertical codes and pass codes used in twodimensional coding schemes, are decoded by the microprocessor. The variable length codes having a second type, such as one-dimensional horizontal codes are decoded, by a pair of look-up tables in read only memories (ROM's). one ROM determines the length of the code …
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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
- Granted July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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.