Advance/retreat cutting miner
CA 2010545 C · Owner: Coaltex, Inc. · Inventors: Delli-Gatti, Frank A. Jr.; Justice, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mining machine and method allow coal or the like to be mined substantially as quickly during out cutting as in cutting. A front cutter is mounted at the front of the frame, and a first conveyor -- which preferably comprises a chain conveyor -- conveys cut coal from the front of the frame to the rear and ultimately out of the area being mined. A second conveyor is mounted in back of the front cutter for conveying cut coal from adjacent the rear of the frame towards the front, and ultimately to be deposited on the first conveyor. A rear cutter is located to the rear of the second conveyor for cutting material during out cutting to be moved to the second conveyor as the machine moves …
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 February 21, 1990 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 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.
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.