Ballast tamping unit for mounting on a tamping machine and a tamping tool therefor
CA 2017822 C · Owner: Theurer, Josef · Inventors: Theurer, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ballast tamping unit for tamping ballast under two successive ties comprises a vertically adjustable tamping tool carrier and a set of two pairs of opposed vibratory and reciprocable tamping tools mounted on the tamping tool carrier, the pairs of tamping tools being so spaced from each other that two adjacent tamping tools of the pairs may be immersed in the crib between two successive ties and two remote tamping tools of the pairs may be immersed in respective cribs adjacent the successive ties. Each tamping tool comprises a tamping pick having a substantially straight shaft having a center axis extending between a lower and an upper end, a tamping jaw at the lower tamping pick shaft end …
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 30, 1990 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 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.
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.