Synthetic rutile production
CA 2136426 A1 · Owner: Warner, Noel Alfred · Inventors: Warner, Noel Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hot metal is circulated by R-H unit in a closed loop path through first and second hearths and chambers. Titaniferous material containing iron oxide is introduced into first hearth and the iron oxide therein is reduced in a heating zone in the first hearth to iron to produce titania slag having a reduced iron content which is removed in chamber before the hot metal passes via an underflow weir into chamber at which coal is added and a proportion of the hot metal is removed. The addition of coal is such that more than 2% by weight of carbon dissolves in the hot metal in the second hearth. Coal ash slag is removed at chamber, whilst the hot metal containing the dissolved carbon is …
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 21, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2015.
- 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.