Releasable anchoring and tensioning apparatus for billboard displays
CA 2053307 A1 · Owner: Hillstrom, David U. · Inventors: Derosa, Nicholas A.; Hillstrom, David U.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An anchoring apparatus (120 220, 320, 420) for anchoring and, tensioning a sheet material (14) on a panel structure (10) such as , a billboard. A preferred channel-shaped base member (124 224, 324, 424) is secured to the rear of the panel structure (10) and includes a clip member (140, 240, 340, 440) slidably interconnected with the base member. The clip member is selectively biased to tension the sheet material, or disengaged to release or relax the sheet material, preferably by way of a spring member (150 250, 450) and by way of actuation of a preferred built-in anchoring handle mechanism (280, 380, 498) thus greatly facilitating the ease and speed of erection, anchoring, tensioning and …
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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 March 6, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 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.