Method and apparatus for manipulation of impactor hammers
CA 2043348 A1 · Owner: Downs, John S. · Inventors: Bechler, David J.; Downs, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for manipulating horizontal impactor hammers includes a crossbeam and a pair of depending lift arms each lift arm having a corresponding pivot arm configured to be secured to respective ends of the hammer and to pivot about the lift arm. Once the pivot arms are attached to the ends of the hammer, the crossbeam is elevated, withdrawing the hammer from the rotor and causing the hammer to invert about the pivot axis for reinsertion into the rotor. Provisions are also made for rotating the withdrawn hammer about a vertical axis. 16
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 May 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 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.