Hydraulic railroad car door with program plate
CA 1089713 A · Owner: Owen, Robert E. · Inventors: Owen, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic railroad car door assembly comprising a sliding door of the plug type carried on crank arms rotated by shafts rotating with respect to the door the door opening, and closing by the swinging of the crank arms which are carried by tracks on which the door slides a program plate, slidably mounted on the door and having slots therein door, latching assemblies, and means including pins received in the slots for causing sequenced unlatching and door opening and sequenced door closing and latching as said program plate is reciprocated by a cylinder controlled by a hydraulic pump. - 2 -
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
- Granted November 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 1997.
- 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.