Process for the production of a heat exchanger and apparatus for carrying out the method
CA 2075629 C · Owner: Borchert, Werner · Inventors: Borchert, Werner; Von Cleve, Hans-Henning
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device disclosed comprises a support belt (3) for vanes (7) vane drive belts (6) located beside the support belt (3). a vane-feed device and a beam (laser or electron) welding device (11) which welds from the inside, vanes (7) on to the outsides of tube halves (10). When the vanes have been mounted in place on the tube halves (10) the vane/tube-half assemblies are welded together along their longitudinal edges (27) to form complete tubes. These tubes can then be galvanized individually or in bundles for use as heat-exchangers.
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 30, 1991 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.
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.