Flexible telescopic prop for building materials
CA 2057922 A1 · Owner: Quante, Heinrich · Inventors: Quante, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57) Abstract, A structure for supporting mining cavities in underground mines and tunnels comprises props or elements (1) filled with building material (6). The elements (1) are composed of several telescopic inner and outer tubes (4, 5) which can be braced against each other and against the roofs and floors by means of a suitable mechanism. The telescopic prop is first braced in this manner and then filled with building material (6). The building material (6) can be rapidly and advantageously hardened by means of a drainage device, in particular drainage boreholes (49 50), and therefore a structure of this type can absorb high supporting forces. The core of building material is secured by …
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 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2012.
- 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.