Eccentric knockouts for metal boxes
CA 1260597 A · Owner: Hubbell Incorporated · Inventors: Lewis, Thomas E.; Jorgensen, Robert W.; Kesler, Gregory J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A knockout structure is provided for selectively forming openings for either one of two different sizes of conduit. The center of the inner knockout is offset from the center of the outer knockout creating, an eccentric relationship which permits a positive ground to be established between the smaller conduit and the box wall by a standard lock washer when the smaller conduit is mounted therein. A secure mechanical connection is similarly established.
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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.