Steel drum
CA 1329155 C · Owner: Irwin, Robert D. · Inventors: Troughton, Thomas D.; Irwin, Robert D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high strength metallic drum is disclosed having an high internal volume for given external dimensions. The drum is divided into annular top middle and, bottom drum sections. Each drum section has a constant diameter, with the diameters of the top and bottom drum sections being larger than the diameters of the middle drum section. A pair of swedge rolling hoops are provided at the boundaries between adjacent sections to give the drum rigidity. A first one of the rolling hoops joins the top and middle sections while the second rolling hoop joins the middle and bottom sections. Each swedge rolling hoop has a gripping surface that extends outwardly from the middle drum portion to facilitate …
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 May 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
- 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.