Sand lump dissolving and feeding machine
CA 2215616 A1 · Owner: Antcan Ltd. · Inventors: Wallgren, Kris
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 a novel machine for dissolving lumps of sand and dispensing flowable sand at a pre-determined rate from a sand hopper. In particular the, invention comprises a screw feeder with teeth or an uneven screw flight perimeter which, is located at the bottom of a steel or metal hopper and which rotates to grind sand lumps down to feedable size while it is feeding or dispensing flowable sand from the hopper. THIS PAGE SHOULD NOT APPEAR IN THIS SECTION THIS PAGE SHOULD NOT APPEAR IN THIS SECTION THIS PAGE SHOULD NOT APPEAR IN THIS SECTION
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 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.