Internally enhanced tubes
CA 1294271 C · Owner: Zogg, Robert A. · Inventors: Zogg, Robert A.; Robertson, Gerald F.; Brown, Will C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An enhanced heat-transfer tube for use in a condenser of a refrigeration system, in which fine grooves having a depth equal to or less than 0.0012 inches, when the refrigerant has a mass velocity equal to or greater than 200,000 lbm/hr-ft2 improves the average heat-transfer coefficient.
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
- Granted January 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 14, 2009.
- 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.