Bag construction for a dock leveler
CA 2173211 A1 · Owner: Hodges, Charles Harwood · Inventors: Hodges, Charles Harwood; Warner, Robert J.; Wagner, Donald A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inflatable bag assembly (11) for a dock leveler (1) including a stack of superimposed bags (20 21) which are joined together, along contiguous surfaces. The interiors of the bags are connected to a suitable source of low pressure gas such as air. The stack of superimposed bags is positioned between a supporting surface (5) on a loading dock (3) and a ramp (6) which is hinged to the dock and is movable between a horizontal position and an upwardly inclined position. By supplying air to the bag assembly (11) the bag assembly, (11) is inflated thereby moving the ramp (6) from the horizontal to the upwardly inclined position.
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
- Filed September 26, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2016.
- 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.