Frame for a covering for an opening protected by a cover or grating
CA 1302766 C · Owner: Ferns, Derek, "Lord Lighthorne Of Glenfield" · Inventors: Ferns, Derek, "Lord Lighthorne Of Glenfield"
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Frame comprises a pipe length and an outwardly projecting marginal portion located on the outside of pipe length. Projections are provided on the inside of pipe length and on these can be supported a cover or grating. The marginal portion is constructed as a cohesive collar which projects, horizontally outwards. Marginal portion is located at a height below the upper border, the height being a third to a half of the total height of pipe length. Due to the fact that the marginal portion is spaced from the upper border of pipe length, during the installation of frame it is surrounded on all sides by the material of the road surface so that the frame is connected in stable manner to the ground …
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 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 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.