Hollow lightpipe and method for its manufacture
CA 2004087 C · Owner: Levy, Michael B. · Inventors: Levy, Michael B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light pipe is formed from an elongated substrate having a highly reflective coating formed on one surface thereof. The elongated ribbon is formed into a tubular structure, with a reflective inside surface. If desired the elongated ribbon can be formed from a composite material having variable Young's modulus, thereby providing a neutral surface close to the reflective surface thereby promoting, adherence of the coating to the inner surface of the tubular structure. If desired, the longitudinal seam and the resulting tubular structure can be welded. In an alternative form of the hollow light pipe the tubular, structure can be placed inside a tubular housing which can be either formed 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 28, 1989 and granted May 17, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 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.