Hollow fiber glass roof bolt
CA 1294157 C · Owner: Jacks, R. Keith · Inventors: Perry, John H.; Duff, Howard S.; Jacks, R. Keith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a hollow roof bolt based on, a) a hollow rod, b) a collar which is internally tapered and fitted over one end of the rod and, c) a hollow plug located in the end of the rod having the collar, the plug being externally tapered such that it forces the rod to expand and thereby conform to the internal taper of the collar. The present invention is additionally directed to the rod in combination with a roof plate such that the roof plate fits flush against the distant end of the collar.
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.