Electro-pneumatic spring and service brake actuator
CA 2100684 C · Owner: Alliedsignal Inc. · Inventors: Latvala, Bruce Earl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electro-pneumatic braking system includes a tandem brake actuator (12) including a service brake actuating section (16) and an emergency/parking spring actuated section (18). Hold-off pressure is communicated to the emergency/parking section through a three-way solenoid valve (54) from a pressure reservoir (42) and , communication to the service actuator is controlled by electro-pneumatic modulator (56). Service pressure is taken both from the branch of the conduit communicating with the air reservoir (42), but also from the hold-off pressure in the emergency/parking reservoir (34). Accordingly, only a single line communicates fluid pressure from the reservoir to the brake and …
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 June 13, 1991 and granted September 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2013.
- 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.