Retrofit readout
CA 1234934 A · Owner: Otis Elevator Company · Inventors: Koe, Joe K.; Doane, John C.; Jacoby, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Retrofit Readout, Abstract, A display (22) has one or more digits (22-1,22-2) each capable of displaying a plurality of alphanumeric characters. A character control (10) has an output line (12) for each possible character and provides a signal over the line to cause the character to be displayed by activating an opto-isolation device (20-1). The output lines (20-1) are connected to a plurality of scan devices (26-1) which are individually addressed by a computer (28). Each scan device (26-1) is connected to a group of lines (20-2) that are individually addressed by the computer (28). When a line (20-2,20-3) is found to have a signal on it, the line is given a name which is used by the …
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
- Granted April 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 5, 2005.
- 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.