Coke oven door with hollow stopper made of ceramic material
CA 2077749 A1 · Owner: Wessiepe, Klaus · Inventors: Stewen, Willhelm; Wessiepe, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coke oven door has a hollow stopper made of ceramic material with supporting elements in the form of mats both sides of which are provided with layers of refractory material applied by the concrete-spraying process. The hollow stopper (1) is formed from two ridge-shaped wall elements (2, 3) and a pivoting closure element (4). The closure element (4) is preferably connected to the wall elements (2, 3) by connecting elements (12 19, 20).
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 August 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2013.
- 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.