Process for the production of moulded articles
CA 2042969 A1 · Owner: Von Bonin, Wulf · Inventors: Kruger, Klaus; Von Bonin, Wulf; Von Gizycki, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the production of moulded articles Abstract, Moulded articles are produced by heating expandable graphite, in which the expandable graphite is first preexpanded at 140 to 450°C until a bulk density of 30 to 500 g/l has been reached, at least 50 % by volume of a mould is then filled with the graphite thus pre-expanded and the expansion of the graphite is then completed in the mould by heating to temperatures in the range from 300 to 700°. Le A 27 742-Foreign countries
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, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.