Safety ladder
CA 1233798 A · Owner: Fahrleitungsbau Gesellschaft Mit Beschrankter Haftung · Inventors: Brinkmann, Arnfried; Lehners, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A safety ladder comprises a vertical central ladder stringer and a plurality of horizontal rungs attached thereto, wherein the central ladder stringer has a substantially C-shaped cross section with a front longitudinal slot a rear, transverse piece lying opposite to the longitudinal slot this, rear transverse piece having rounded longitudinal edges. The rungs are attached from the outside to the central ladder stringer and are bent with their free outer members forward. In order to provide a better distribution of the climbing forces without impairing any corrosion protection measures or obstructing the interior of the longitudinal slot, the rungs are provided with a preferably equal …
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 March 8, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 8, 2005.
- 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.