Expired Canadian patentCanada
Indented tube for optical ribbon
CA 2058203 C · Owner: Mcalpine, Warren W. · Inventors: Kundis, Dieter; Mcalpine, Warren W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a tube holding optical fibers or optical ribbons, the tube having indentations in its inner and outer surfaces. The indentations are adjacent to better enable opening of the tube to gain access to the ribbons.
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 December 20, 1991 and granted June 10, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 20, 1991
GrantedJune 10, 1997
Term endedDecember 20, 2011
Patent numberCA 2058203 C
Classification (IPC)G02B6/44
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.