Railroad warning signal device
CA 1083698 A · Owner: Thomas, Marion V. · Inventors: Thomas, Marion V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A warning device visually enhances the signalling of a dangerous situation such as an approaching train at a railroad crossing. The warning device includes oppositely rotating rims to which light reflecting discs are attached in surrounding relation to hubs fixed to the arms of a frame extending laterally from a vertical support post. Fixed light emitting surfaces are mounted on the hub facing opposite directions.
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
- Granted August 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 1997.
- 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.