Railway light signal
CA 2108198 A1 · Owner: Martin, James M. · Inventors: Dinger, Ronald W.; Donatello, David A.; Barker, Kenton H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light signal provides fixed focus and aspect to aspect alignment. This signal comprises a housing having a rear entry for maintenance thereof and such that a lens mount containing a lens unit can be removably secured to a selected inside surface of the front wall of the housing to align the lens unit with an aperture in the front wall and wherein a means for securing each lens mount to an inside surface of the front wall is provided such that the lens unit is secured in the lens mount in aspect alignment and each lens unit is in aspect to aspect alignment with any other lens units contained within the housing. Each lens mount includes a fixed focusing means having a receptacle for …
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 12, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2015.
- 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.