Expired Canadian patentCanada
Concrete roof tiles
CA 1306117 C · Owner: Fifield, John Alfred · Inventors: Hammond, Leslie Gerald; Fifield, John Alfred
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interlocking roof tile (1) of which the lower end portion (12) at least as far as the lower end of and, including the underlock (6) is tapered in the direction of the lower edge (5) of the tile (1).
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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 11, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 11, 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.
FiledJanuary 18, 1989
GrantedAugust 11, 1992
Term endedAugust 11, 2009
Patent numberCA 1306117 C
Classification (IPC)E04C2/00 +2 more
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.