Method and apparatus for using blast-furnace slag in cement clinker production
CA 2215406 C · Owner: Texas Industries, Inc. · Inventors: Young, Rom D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus by which crushed and screened blast furnace slag (80) can be added to the feedstock materials (76) fed into the feed-end of a rotary cement kiln to form cement clinkers (82). The blast furnace slag is crushed and screened to provide blast furnace slag particles having particles with a size of up to a maximum diameter of substantially 2" or less. The apparatus (10) includes a rotary kiln (12) supported by flanges (14) that rotate with the kiln. The kiln has a feed end (16) and a burning zone (18). A fuel source (20) creates a flame (22) in the heat end of the rotary kiln. A variable speed conveyer belt (24) carries feedstock material to the kiln and the blast …
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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 January 16, 1996 and granted November 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2018.
- 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.