Method for rubberizing and/or pelletizing trinidad lake asphalt
CA 2305250 A1 · Owner: Nicholas, Dolly · Inventors: Nicholas, Dolly
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method of processing Trinidad Lake Asphalt (TLA) including the steps of , removing Trinidad Lake Asphalt from the earth and adding thereto at least one stabilizing material of a type which increases the melting point of the TLA to produce a stabilized product. The stabilizing material is preferably clay carbonaceous material, silica and/or polymer. The stabilized product is then pulverized or otherwise broken down into discrete elements such as pellets or , powder. The discrete elements are then packaged into for example, polyethylene bags and stored or transported for later use. The stabilizer prevents the discrete elements from coalescing during storage or transport. The bags of …
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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 October 7, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2020.
- 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.