Machine safeguard having infrared light presence sensor
CA 1093192 A · Owner: Canadian General Electric Company Limited · Inventors: Harris, Robert P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A presence sensor for safeguarding a machine has a plurality of light sources and opposed light detectors providing a protective curtain in front of an area to be protected. The photodetectors are connected to respective gates which are enabled in sequence as the corresponding light sources are energized in sequence. Each light path that is obstructed causes a pulse from the gates and these pulses are totalled for each sequence to provide a total count output. A comparator compares the total count output to a predetermined number representing a permissible number of obstructed light paths. If the total count output exceeds the predetermined number the comparator provides a signal which …
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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 January 6, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 6, 1998.
- 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.