Pneumatic pressure operated parking brake for a railway vehicle brake system
CA 2188107 C · Owner: Ring, Michael E. · Inventors: Hawryszkow, Michael G.; Ring, Michael E.; Natschke, Scott L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Air pressure actuated and hydraulic applied railway car parking brake system includes air source to actuate. A control valve receives air from source to initiate air communication. Pneumatic to hydraulic pressure intensifier receives air in first chamber therein from valve. A second intensifier chamber is connected at open first end thereof with partially open second end of first chamber. Hydraulic fluid is disposed in second chamber adjacent closed second end thereof. A force transmitting cylinder in fluid, communication with second chamber exerts force on brake beam, carrying brake shoes thereon which are brought and maintained in frictional engagement with a respective surface of tread …
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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 17, 1996 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2018.
- 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.