Capped electric lamp
CA 2108087 A1 · Owner: Van Dulmen, Hendrikus A.M. · Inventors: Van Dulmen, Hendrikus A.M.; Verspaget, Godefridus N.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The capped electric lamp of the invention has a ceramic cap (10) having a shell portion (12) and an integral base portion (11) which bears metal pins (13). A lamp vessel (1) having a seal (4), from which current conductors (3) to an electric element (2) within the lamp vessel extend beside one another to the exterior is fixed in the cap, (10). Outside the lamp vessel the current conductors (3) each have a portion having a glass envelope (6) which is connect d to the seal. The glass envelopes (6) defining a slit (5) between them. A ceramic partition wall (20) having a foot (21) is fixed on the base portion (11) and extends into the slit (5) thereby creating for the current conductors and …
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 October 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2015.
- 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.