Control mechanism for a rolling door
CA 2249804 C · Owner: Hung, Jin-Shan · Inventors: Hung, Jin-Shan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic stop mechanism for a rolling door includes two brake members mounted to the stop member which is removably engaged with the fixture, the stop member having a flange disengagably contacting the inclined flange to normally stop the rolling door, a handle pivotally connected to the fixture and, connected to the first member and the second member so as to shift the stop member, along the shaft of the motor, the two brake members each having a brake pad and, located within the motor casing, when the rolling door runs downwardly fast and the, normal stop mechanism fails, the two brake members are expanded due to the eccentric force to stop the door by the two brake pads …
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 October 6, 1998 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2020.
- 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.