Data transmission on optical networks
CA 2064581 C · Owner: Pearson, Ian David · Inventors: Pearson, Ian David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a system for transmitting data cells from a transmitter (1) to a receiver (2,3) each cell comprises a fixed format head containing address information and a free format time slice of predetermined duration. The cells may be transmitted on an or cat network (4) in which case the cells are routed by an optical switch (5) which reads the header and is transparent to the f: format time slice. Second level cells are formed comprising a second level header and a time slice filled with a number of first ~el cells.
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 July 23, 1990 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 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.