Method for producing internally finned tubing
CA 2028638 A1 · Owner: England, Jimmy C. · Inventors: Moehling, Frederick E.; England, Jimmy C.; Ruble, Hugh H. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cold working process for fabricating internally finned tubing is disclosed. A smooth tube shell is inserted over a tapered grooved mandrel disposed in a tube reducer (Pilger mill). The roll die in the reducer cause the tube to elongate and imprint the fins into the internal diameter of the tube.
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 October 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2012.
- 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.