Multi-layer tolerance checker
CA 2017865 C · Owner: Northern Telecom Limited · Inventors: Turudic, Andy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Multi-layer printed circuit boards are sometimes connected to transmission paths which may be susceptible to electrical discharges associated with transient electrical events occurring along the transmission path. A method is provided for assuring that two respective layers of the printed circuit board are aligned within predetermined tolerances. Aligning respective layers within acceptable tolerances provides a means of assuring that predetermined distances between a ground layer and a power layer will be maintained, thereby ensuring that electrical arcing will not occur between the power and ground layer in the event of voltage spikes or current surges.
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 May 30, 1990 and granted June 21, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 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.