Apparatus for telephone line checking
CA 2087065 A1 · Owner: Hilligoss, Lawrence O. · Inventors: Hilligoss, Lawrence O.; Butler, Myron C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PATENT, Abstract of the Disclosure, The equipment includes a front panel with LED indicators, key pad and a number of special function keys as well as an LCD message printout and volt/ohm meter. A hand set is readily available at the front panel as the line check unit functions with a commercially available craft terminal, a CMC Type 7910D terminal known as DATASTARTM which includes the master central processing unit and random access memory for interactive function with the line check system. The DATASTARTM unit communicates directly with a controller section that includes speaker power amp LCD, circuitry and 128K random access memory as well as a digital bus interface. The controller …
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 January 11, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2015.
- 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.