Prestressed concrete roadway
CA 1106216 A · Owner: Barnett, George D. · Inventors: Barnett, George D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A concrete slab is provided with prestressing cables to be post-tensioned upon setting of the concrete. The posttensioning cables or strands are equally spaced on predetermined centers and are angled with respect to the longitudinal axis of the slab. All of the strands are parallel and are substantially co-planar with all other strands. The angle between the longitudinal axis of the slab and the strands ranges from 30° to 60°.
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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.