Wall climbing form hoist
CA 1239035 A · Owner: Economy Forms Corporation · Inventors: Phillips, Jim D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A climbing form for progressively raising a form assembly in the construction of a concrete wall. The hoist has a support frame that adjustably carries a mast form unit, a main mast assembled with the frame for relative up and down movement, and a jib mast equipped with a lifting means, extended upwardly from the main mast. A carriage within the main mast is releasably locked to the frame when the main mast is moved relative to the frame, and is releasable for up and down movement within the upper section of the main mast to raise and lower a jib form unit. A reversible nut and shaft drive means has the shaft rotatably supported in the mast upper section with the nut mounted on 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 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 12, 2005.
- 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.