Protective device for a stand lamp
CA 2201072 C · Owner: Wang, Jack · Inventors: Wang, Jack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A protective device is used with a stand lamp which includes an upright lamp stand, a lamp base mounted on a top end of the lamp stand, a reflector mounted on the lamp base, and a lamp mounted horizontally on the lamp base and confined by the reflector. The protective device includes at least one sensor unit adapted to be mounted on the reflector and capable of generating a sensor light signal corresponding to intensity of light detected thereby, and a control circuit connected electrically to the sensor unit and adapted to interconnect electrically the lamp and a power source. The control circuit is capable of disconnecting the lamp from the power source upon detection that the sensor …
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 March 26, 1997 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2019.
- 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.