Corrugated pipe
CA 1283370 C · Owner: Holcomb, Richard A. · Inventors: Holcomb, Richard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spirally wound corrugated pipe of sheet steel or the like is provided with outwardly convex corrugations which are spaced apart, with a flat portion of single wall thickness between adjacent corrugations. In one embodiment the corrugations have, a pitch of five inches and a height of one-half inch; in another embodiment, the pitch is six inches and the height is one inch.
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 April 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2008.
- 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.