Process for the manufacture of a shaft bottom
CA 2522196 C · Owner: Schlusselbauer, Johann · Inventors: Schlusselbauer, Johann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for the manufacture of a shaft bottom made of concrete and comprising a chute , of a predetermined shape concrete is introduced into a bottom mould (1) comprising a , mantle (2) and a mould bottom (3) on which a moulded body (8) forming the negative , mould of the chute is arranged on the mould bottom (3) for the formation of the chute. In order to permit an inexpensive and mechanical production of a shaft bottom comprising , an individual chute, the moulded body (8) is formed from at least one moulded piece (9) , which can be fastened to the bottom mould (1) in particular to the mould , bottom (3) which , moulded piece (9) is adjusted to the dimensions of the …
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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
- Filed March 26, 2004 and granted June 11, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2026.
- 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
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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.