Elevator system
CA 1234933 A · Owner: Westinghouse Electric Corporation · Inventors: Tinios, Pantelis G.; Kvartin, Igor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
52,067, ABSTRACT OF THE DISCLOSURE, A traction elevator system having an elevator car driven by a dual converter bank, solid state motor drive. The solid state motor drive includes bank selection circuits, which select the operative converter bank at any instant, and firing circuits for providing firing pulses for the selected converter bank. The energization and deenergization of the bank selection circuits and firing circuits are controlled such that the bank selection circuits are energized before the firing circuits and, upon loss of power, the bank selection circuits are deenergized after the firing circuits.
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 April 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 5, 2005.
- 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.