Heat exchanger tube
CA 2200671 C · Owner: Naumann, Ulrich · Inventors: Naumann, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The exchanger tube has a smooth outside surface and a structured inside surface. The inside surface is formed from parallel primary and secondary, ribs that run at an angle with respect to the longitudinal tube axis and respectively, comprise inclined, planar flanks channels that are limited laterally by the primary, and secondary ribs and troughs shaped into the primary and secondary ribs. The radial height of the secondary ribs is less than that of the primary ribs. The troughs, are triangular. The center longitudinal planes of the troughs are disposed at an, angle with respect to the longitudinal tube axis. The summits of the primary and, secondary ribs are rounded. Rounded …
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 March 21, 1997 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2019.
- 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.