Emergency stop circuit direct current elevator drive
CA 2265327 A1 · Owner: Ramos, Julio C. · Inventors: Piserchia, Gerard G. Jr.; Ramos, Julio C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An emergency stop circuit for an elevator drive includes an emergency stop control (7) that selectively varies the current flowing in a field winding (4) of a, direct current drive motor (M). During an emergency stop the motor (M) , operates as, a generator and has an armature winding (1) loaded with a braking resistor (9) to, apply a voltage, depending on the direction of movement of the elevator car either, by a first switch (10) and a second switch (11) or by a third switch (12) and , a fourth switch (13). The switches (10, 11, 12, 13) are connected as an H-bridge between the, windings (1, 4) and are controlled by the emergency stop control (7) depending on, the deceleration required …
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 March 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2021.
- 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.