Safety device, particularly for roll-up doors
CA 1304099 C · Owner: Larsson, Nils Hakan Ivar · Inventors: Larsson, Nils Hakan Ivar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A safety device particularly intended for use in, roll-up doors for the purpose of causing reversal of the closing movement of the door when an object is obstructing the path of movement of the door. The device comprises at least one signal emitting means which is arranged to emit a beam of light a beam of, sound or another kind of signalling beams and which is supported by the door-leaf some distance from the door-leaf closing edge. The signalling device emits a beam of light a beam of sound or a, signalling beam of another nature across the width of the door-leaf at such a distance from the lower closing edge of the door-leaf that any object that interrupts the beam emitted by the …
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 June 23, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 2009.
- 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.