Access covers for manholes
CA 1298122 C · Owner: Centa, Antony Richard · Inventors: Centa, Antony Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The cover is of the kind in which a removable cover member fits within an outer surrounding frame the cover also, being in the form of an inner frame with an appropriate filling material e.g. concrete. The object of the invention is to enhance the appearance of the upper edges of the inner and outer frames. In accordance with the invention this is achieved by, providing the upper edges as decorative strips which are positively fixed to the upper edges of the frame members by a tongue and groove joint. Preferably, the groove (21) is formed with at least one splayed-out wall (20) which is pressed into longitudinal engagement with a corresponding wall of the tongue (22), e.g. by traversing 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 March 31, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 31, 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.