Portable ventilating apparatus for purging underground installations and the like
CA 1110904 A · Owner: Pelsue (T.A.) Company · Inventors: Beavers, Allan E.; Pelsue, Bradley A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PORTABLE VENTILATING APPARATUS FOR PURGING UNDERGROUND INSTALLATIONS AND THE LIKE" ABSTRACT OF THE DISCLOSURE, This invention relates to a portable ventilating apparatus particularly well suited for use in purging underground installations. characterized by a collar having a deflector atop thereof mountable within an entryway on the surface leading below ground a duct hanging from the, underside of the collar extendable well down into the area to be ventilated in spaced relation to the entryway so as to leave an annular exhaust passage therebetween, a tapered nozzle supported within the mouth of the collar cooperating with the deflector to define an annular air intake passage, and a blower …
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
- Granted October 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 1998.
- 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.