Signalling system
CA 2176459 C · Owner: Hedberg, Mats Olof Joakim · Inventors: Hedberg, Mats Olof Joakim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a signalling system which is adapted for digital signals and which includes a signal transmitter, a signal receiver and a connection which connects the transmitter to the receiver. The transmitter includes an output buffer which has at least one transistor connected to the lowest level of a signal supply voltage such as "O" potential or earth potential. Driving or steering of the transistor in response to a received control signal causes the transistor to switch from a state of high impedance to a state of low impedance which exhibits resistive or at least predominantly resistive properties such as to form an information-carrying output signal. A first of two …
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 1, 1994 and granted February 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2016.
- 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.