Portable pitless livestock gate
CA 2043166 A1 · Owner: Cobbe, James A. · Inventors: Cobbe, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A portable pitless livestock barrier whereby vehicles or humans may easily gain access to a livestock enclosure but provides a deterrent to the unwanted passage of the livestock from such enclosure. The barrier is provided by having a horizontal main frame to be placed on the ground with a vertical frame supported and attached to each side of the main frame. Within the boundaries of the main frame are two platform grates that are connected to the main frame at the exit and entrance to the barrier but can be adjustably raised in the central area of the barrier by a spring biased lever lifting mechanism attached to each vertical frame which allows the platform grates to be forces to the …
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 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 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.