Light source with gradually changing intensity
CA 1314069 C · Owner: Shaffer, Blaine P. · Inventors: Haab, William G.; Shaffer, Blaine P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device and method of awaking a sleeper includes an alarm clock coupled to a control circuit for controlling the power provided to a lamp. After the alarm clock wake-up signal is provided, the light intensity emitted by the lamp slowly, smoothly and gradually increases. The time interval over which the light intensity increases is selectable by the user but will usually be in the range of thirty minutes to an hour. The circuit for increasing the light intensity is designed to ensure that the intensity increase is smooth especially at the beginning of the wake-up cycle. A photo resistor adjacent an LED is part of a parallel resistive network which lowers the firing angle of a triac to …
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 March 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 2, 2010.
- 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.