Duct board assembly
CA 1047419 A · Owner: Mutz Corporation · Inventors: Jones, James E.; Marquette, Ralph L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a duct board assembly which comprised a panel of conventional duct board formed of rigid thermal insulation to which is attached boardering strips on one face of the panel; the panel may be provided with spaced, longitudinal grooves to define the wall widths of an air duct section to be formed from the duct board assembly and the outer margins of said panel-framing strips being provided with locking means to provide a closed longitudinal seam for the air duct section and to provide for closed joining end-to-end, of successive, duct sections. -2-
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 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 1996.
- 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.