Double layer electrode coil for a hid lamp and method of making the electrode coil
CA 2387331 A1 · Owner: Osram Sylvania Inc. · Inventors: Denham, Stuart K.; Huntington, Charles A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A double-layer electrode coil for a high intensity discharge (HID) lamp and a method of making the electrode coil are provided. A more stable layer of coils is, made by front winding, instead of back winding the layers of wire. The second , layer of wire is entirely within a helical groove on the exterior surface of the first layer of, wire. This arrangement is particularly stable and permits more rapid insertion of the, electrode shank after removal of the mandrel.
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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
- Filed May 24, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 24, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2024.
- 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.