Lifting device
CA 2255751 A1 · Owner: Persson, Curt · Inventors: Persson, Curt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an apparatus for lifting and moving articles comprising at least one arrangement (12) with a cavity (14) hereafter called , vacuum chamber, which is connected to an arrangement (40) which is capable of producing negative pressure in said vacuum chamber the underside of said , lower plate (16) being provided with an elastic airtight bottom (18) and also being provided with a number of first through-passages (20) to said vaccuum chamber. The invention is characterized in that each first passage (20) is of cylindrical design with a diameter reduction in the part which is connected to the vacuum chamber, forming a shoulder (22) in the passage in that 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
- Filed May 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2019.
- 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.