Large diameter wafer dryer with adjustable flighting
CA 2175385 C · Owner: Thompson, Stanley P. · Inventors: Gobel, Richard J.; Thomas, Daniel W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dryer for drying material car-, ried along and dried by hot gases including a hollow rotatable drying drum (10) with an inlet (15) and a discharge end, means (12,13,14) for driving the, drum in rotation and a group of flights projecting into the gas flow stream to break up the material and retard the, speed of flow of the material with the flowing gases with the flights arranged in one group at the outer periphery inside the drum and the other supported, on a central axially extending shaft (18) and arranged on the ends of arms (19, 20) projecting radially from the shaft to provide satellite groups (40,41) which are adjustable in a radial rotational and axial directions to change their …
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 October 14, 1994 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2016.
- 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.