Transition element
CA 2055175 A1 · Owner: Armstrong World Industries, Inc. · Inventors: Mathis, James F.; Bischel, Wesley T. K.; Claussen, Donald F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The invention is directed to a transition element for use between an upper ceiling level and a lower ceiling level to form a two-level ceiling. The transition element has a configured surface, particularly a curved surface. The transition element is mounted with the top of the curved surface located adjacent the plane of the upper ceiling level and the bottom of the curved surface being located in the plane of the lower ceiling level so that the curved surface forms a transition surface between the two ceiling levels. The transition element is held in position by the ceiling runners used to hold the ceiling boards in position.
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 November 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2013.
- 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.