Electromagnetic shear lock
CA 1328895 C · Owner: Harrow Products, Inc. · Inventors: Frolov, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electromagnetic shear lock comprising an electromagnet assembly adapted to be mounted to a doorway and an armature assembly adapted to be mounted to a door in a position to be attracted to the electromagnet, the electromagnet comprises an elongated core of E-shape in cross section with an energizing coil positioned about the middle leg of said E-shaped core and between the outer legs of said E-shaped core. The electromagnet assembly in one embodiment has projections on either side and at both ends thereof extending beyond the surfaces of the core. An armature member has a generally rectangular surface adapted to be mounted to a door and positioned to be attracted by the electromagnet, …
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 April 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2011.
- 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.