Gripping device for retaining a ring member supporting a manhole cover
CA 2071187 A1 · Owner: Claing, Jean-Louis · Inventors: Claing, Jean-Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a gripping system for holding a supporting ring member adapted to support a manhole cover in a tubular member having a peripheral horizontal shoulder. The gripping system has a plurality of rigid elbowshaped members internally secured inside the ring member. The elbow-shaped members have a horizontal arm radially extending inside the ring member and a substantially vertical pending arm extending below the ring member and adapted to internally face the tubular member. A screw member is threadedly mounted through the vertical arm in the direction of the tubular member. The screw member is provided with a friction plate fixed at one end between the vertical …
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 June 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 2014.
- 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.