Reversible unidirectional abrasive flow machining
CA 2095254 C · Owner: Kohut, Thomas A. · Inventors: Rhoades, Lawrence J.; Kohut, Thomas A.; Nokovich, Nicholas P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Undirectional abrasive flow machining is achieved by a pair of extrusion chambers (50) (52), whereby a first workpiece (70) is fixtured to a first of said chambers (50) and an abrasive medium is extruded from the first chamber (50) through the first workpiece (70), and upon exiting the first workpiece (70) is al-, lowed to fall into and be collected within the second chamber (52). Thereafter, the first workpiece is removed and a second workpiece is fixtured to the second chamber so that the abrasive medium collected therein is extruded through the second workpiece and upon exiting the second workpiece, is allowed to fall into and be collected within the first chamber.
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 30, 1991 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2013.
- 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.