Pearlescent lamp
CA 2114404 A1 · Owner: Gotti, Howard C. · Inventors: Gotti, Howard C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A peralescent lamp comprising a hollow glass envelope enclosing a source of electric light has its interior surface coated an iridescent optical interference film over which is disposed a layer of particulate titanium oxide, wherein both the iridescent film and titanium oxide layer have been formed in-situ inside the lamp envelope as a reaction product of gaseous TiCl4 and H2O. The iridescent film is first formed on the interior envelope surface and then an electrostatic potential is applied to the envelope which changes the reaction produce to particulate titanium oxide which deposits on the interference film.
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 January 27, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2016.
- 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.