Carbon black for varnishes and paints
CA 1088727 A · Owner: Deutsche Gold- Und Silber Scheideanstalt Vormals Roessler · Inventors: Schafer, Hans; Rothbuhr, Lothar; Kuhner, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a carbon black having the following physico-chemical characteristics: primary particle size nm 35 - 120, BET surface area sq m/q 10 - 50 iodine adsorption mg/g 10 - 55, volatile components % 2 - 8 pH value 3 - 6, acidity ml of 0.1N acid per 2 - 12 100 g of carbon black, DBF number ml/100 g 40 - 140 The carbon black is useful in varnish systems such as varnishes and varnish parts.
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
- Granted November 4, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 1997.
- 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.