Prefabricated culvert system
CA 1313956 C · Owner: Hwang, Hyun-Ho · Inventors: Hwang, Hyun-Ho
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a prefabricated culvert system comprising a bottom plate, two sidewall plates intended to be positioned onto the upper surface of the bottom plate adjacent to the side edges thereof, and a cover plate intended to be positioned on top of the sidewall plates to form together with these sidewall plates and a bottom plate a closed duct. Advantageously, this system further comprises a set of projections integrally projecting from the lower surface of the cover plate and the upper edges of the sidewall plates to lock the cover plate onto the sidewall plates. The system also comprises a set of tongue and groove on the upper surface of the bottom plate adjacent each of its side edges …
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 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 2, 2010.
- 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.