Electric lamp base system
CA 2127652 C · Owner: Huang, Shun-Feng · Inventors: Huang, Shun-Feng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric lamp base system includes a cylindrical socket with an inner threaded portion to screw with a lamp, one conductor fitted in a straight groove and a lateral groove extending from the straight groove and having its bottom end inserting in a lead wire, the other conductor vertically provided in a bottom of the socket to contact a bottom hole of the lamp and having its bottom end inserting in another lead wire, and a cap with two opposite projecting-up walls to fit in a center hole in the bottom of the socket from under the bottom of the socket. The two lead wires are deposited through a straight horizontal groove in the bottom of the socket. The two conductors are located far from …
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 8, 1994 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 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.