Hoisting coupling for concrete slabs
CA 1112684 A · Owner: Burke Company (The) · Inventors: Lathrop, Robert L.; Holt, Jack A.; Torbet, Philip A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title, IMPROVED HOISTING COUPLING FOR CONCRETE SLABS Abstract of the Disclosure, A remotely releasable hoisting coupling for engagement with an anchor cast in place within a concrete slab. The anchor provides a passage opening through the surface of the slab and an annular abutment shoulder spaced beneath said surface. The coupling comprises a body insertable into the anchor a pair, of lugs supported in the body at diametrically opposed positions for rocking movement about a diametric axis extending normal to the body, and means to selectively move the lugs between a protruding condition engaged with the abutment shoulder and a retracted condition disengaged from the shoulder. The means to …
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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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.