Construction system with pre-manufactured hole patterns
CA 2191985 C · Owner: Efficient Machinery Co. · Inventors: Hammerschlag, Peter G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A construction system having structural members with pre-manufactured rows of holes for fastening. A first kind of structural member (33, 35 and 35a in fig. 2) has a row of holes equally spaced at a distance N. A second kind of structural member for diagonal bracing (43 in fig. 2) has a row of holes equally spaced at a distance equal to the length of the hypotenuse of a right triangle with the other two sides having a length of N or a multiple of N. A third kind of structural member (24 in fig. 2) has two rows of holes equally spaced at a distance N, with the holes of one row perpendicularly intersecting the holes of the other row. Large diameter fasteners (60 in fig. 8), with a cross-hole …
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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
- Filed June 5, 1995 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2017.
- 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.