Process for continuously producing polyester articles with scrap recycle in a continuous melt-to-preform process
CA 2285444 A1 · Owner: Shelby, Marcus David · Inventors: Carroll, Max Lamar Jr.; Treece, Lanney Calvin; Ekart, Michael Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing polyester articles which generates little or no , polyester waste. The process provides esterification or transesterification of one or more dicarboxylic acids or their dialkyl esters polycondensation to , produce a high molecular weight polyester and molding or shaping of the , polyester for produce the desired product. Scrap produced during the molding process is recycled back to the esterification or transesterification or polycondensation portion of the process. Optionally the scrap may also be , recycled to intermediate steps prior to the molding operation.
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 March 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.