Emergency descending device
CA 2002960 C · Owner: Lin, Shu-Huang · Inventors: Lin, Shu-Huang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an emergency descending device having a life line, one end of which is adapted to be fixed at a high position, the other end of which is adapted to be extended to a low position and a, descending apparatus movably affixed around the life line and usually kept at a high position before operation. The descending apparatus is adapted to suspend a person and carries the person along the life line at a low speed from a high position to a low position. The improvement is characterized by the descending apparatus comprising a decelerating element which is a tubular member axially passed by the life line, forming a contact surface within the tubular member, and in …
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 November 14, 1989 and granted July 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2011.
- 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.