Adjustable mould for casting of stairways in concrete
CA 2000920 A1 · Owner: Thoresen, Bjorn O. · Inventors: Thoresen, Bjorn O.; Thoresen, Bjorn O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A b s t r a c t, An adjustable mould for casting stairways in concrete of the kind wherein the total length of the stairway and also the dimension of the separate steps can be adjusted. The mould comprises a longitudinal substantially plane, horizontal frame (1) having parallel longitudinal, supporting elements (2,2) and two on the support frame provided, identical parallel articulated arm systems (6,8) positioned scissors-like and being linked together at the intersection points of the arms in the system along the longitudinal center axis of the arm systems. At oppositely located outer links (11,11,13,13) in each arm unit are provided means (14,21) for pivotable support for a number of …
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 October 18, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.