Interlocking roof curb joint
CA 2013712 C · Owner: Calam, Bruce Terry · Inventors: Calam, Bruce Terry; Karlowee, Rudy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure This invention relates to a novel roof curb which can be constructed from modular components by interlocking joints. An interlocking joint for a roof curb which comprises a male joint member secured to the inner face of a first curb section and a female joint member secured to the inner face of a second curb section, the male joint member and female joint member being adapted to mate with one another and arrange the first curb section and the second curb section at right angles with one another.
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
- Filed April 3, 1990 and granted September 29, 1992. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2012.
- 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.