Retainer member for use in railway coupling devices
CA 2261512 C · Owner: Daugherty, David W. Jr. · Inventors: Daugherty, David W. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A retainer member for use in either an articulated coupling arrangement and/or a slackless drawbar arrangement for retaining a spherical member in an operating position within a male connection member for connecting together adjacently disposed ends of a pair of railway vehicles in a semi-permanent manner is provided. The retainer member comprises a one piece circular member which is engageable with at least a portion of an inner surface formed by an aperture in a modified male connection member. The circular member is engageable within this aperture of the male connection member to hold the spherical member within the aperture of the male connection member and to form a substantially …
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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 February 12, 1999 and granted July 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 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.