Hydraulic elevator
CA 1180638 A · Owner: Oil Drive Kogyo, Ltd. · Inventors: Hasegawa, Kisaku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the Invention: HYDRAULIC ELEVATOR 2. Abstract of the Disclosure:, This invention relates to a hydraulic elevator wherein working oil is transferred from a tank to a jack or vice versa by means of a hydraulic pump which is driven by an electric motor, so as to cause the elevator to ascend and descend; characterized in that a hydraulic circuit is equipped with electronically-controlled variable flow solenoid valves which set flow rates of the working oil in accordance with a program for electronic control in correspondence with respective stages of stop, slow speed ascent, full speed ascent slow speed descent and full speed descent of the elevator.
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 January 8, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 2002.
- 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.