Magnetic system for sign changing
CA 1284428 C · Owner: Carnell, John Malcolm · Inventors: Carnell, John Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a changeable sign in which the message is displayed on the face of the sign in numeric or alphanumeric characters in segmented format. The board is composed of ferromagnetic material such as, steel, and the message is changed by overlaying selected segments of the characters with flexible permanent magnet strips which have outer surfaces of a color corresponding to that of the face of the board.
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 May 28, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2008.
- 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.