Expansion anchor
CA 1257116 A · Owner: Dom Holdings P.L.C. · Inventors: Limbrick, Robert W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A unitary thick walled spacer supports an anchor rod for engagement in an expansion body. The tubular spacer has a first part of greater diameter than its remaining part, with the latter part in sliding fit engagement in the expansion body and the first part abutting, at its free end, a washer and the head of an anchor rod. The annular rim formed between the parts of the spacer is arranged, prior to use, a distance X from the expansion body. As clamping down is performed in a receiving socket, the spacer part slides inside the expansion sleeve so progressively closing the gap X. The arrangement may be so designed that, in any particular application, the rim never comes into contact with the …
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 July 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 11, 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.