Boiler
CA 2043087 A1 · Owner: Woodward, Rogert M. · Inventors: Woodward, Rogert M.; Jones, Harry P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A boiler comprising a housing having a top provided with a gas outlet, which can be positioned either at the front or rear of the housing to suit individual site conditions bottom, left and right, sides, and a front and back and within the housing an upper, manifold and lower manifold or manifolds substantially parallel to the top, bottom and side walls, two sets of tubes one set of tubes, are bent serpentinely so as to form a plurality of superimposed gas passages, at least two tubes of this set being bent differently so as to form access openings from each passage to the passages above and below. One set of tubes are straight and are substantially in contact with the bends of the …
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 May 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 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.