Process and apparatus for treating asphaltic substance
CA 2025642 A1 · Owner: Certainteed Corporation · Inventors: Robinson, Norman M.; Patti, John J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus is provided for treating asphaltic substance, in which heated asphaltic substance is delivered to a blowing still for oxygen treatment. A portion of the asphaltic substance is withdrawn into a mixing tank in which it is oxygen-, ated at the same time that it is treated for dispersion of oxygen-containing bubbles, for return to the blowing still. The oxygenation in the mixing tank will preferably be provided by air bubbles, with the dispersion being accomplished by mechanical agitation within the mixing tank. Preferably the process is, conducted on a continuous or substantially continuous basis. :
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 September 18, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2012.
- 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.