Local line adapter
CA 2084975 A1 · Owner: Norell, Marvin · Inventors: Norell, Marvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Marvin Norell, Local Line Adapter ABSTRACT OF THE DISCLOSURE, A local line adapter regulates the telephone loop current to a voltage usable by chronograph style electronic devices such as hearing aids radios and time, indicators. The adapter includes surge protection polarity checking and rf filter elements. A rotary switch allows connection with a variety of devices. The adapter may also be used in hospitals, and could be used as an auxiliary power supply for a household furnace for example.
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 8, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2014.
- 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.