An electromagnetic shield
CA 2347394 A1 · Owner: Electro-K, Inc. · Inventors: Kanase, Rick K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electromagnetic shield (20) for protecting individuals from the adverse effects of electromagnetic radiation includes a homogenous composition of finely ground tourmaline and a porous carrier. The electromagnetic shield (20) is attached to a radiating device such as the handset of a portable telephone. The tourmaline reacts with moisture in the air to produce negative ions which cancel the positive ions created by the radiating device thereby , substantially reducing or eliminating the harmful effects of the radiation. The electromagnetic shield (20) composition can be molded into housings for radiating devices.
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 July 23, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2021.
- 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.