Building blocks
CA 1103870 A · Owner: British Industrial Plastics Limited · Inventors: Ogden, Dennis H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for filling the cavity of a building block with resin foam to improve the thermal insulating properties of the block, in which a delivery pipe for the foam has an outlet arranged to seal over a cavity in the block so, that foam can be injected into the cavity until a back pressure is developed in the delivery pipe. By this means proper filling, of each cavity can be assured.
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 30, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 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.