Closed-loop drying process and system
CA 2117788 A1 · Owner: Dinh, Khanh · Inventors: Dinh, Khanh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dryer is designed as a closed system in which heated air used to dry the materials is continuously recycled within the drying compartment of the dryer without being discharged to the atmosphere, thus increasing the efficiency of the system while preventing the discharge of contaminated vapors to the atmosphere and also conserving energy which would otherwise be required to heat or air-condition the air drawn into the dryer from the building in which the dryer is located. A regenerative heat exchanger (140) and an atmospheric cooler/condenser (144) are provided in the dryer and condense and remove moisture from the saturated air and transfer the heat of condensation back into the air …
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 April 12, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2015.
- 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.