Clean air facility
CA 1289405 C · Owner: Spengler, Charles W. · Inventors: Spengler, Charles W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An environmental clean air facility formed of a clear vinyl material secured to a frame formed by PVC pipes and fittings so that the clear vinyl material may be formed and draped over or attached to the frame to form a clean air enclosure. A power unit section including a blower motor having a prefilter unit on opposite ends through which air is drawn from the surrounding medium and directs the air through a HEPA filter, through an air delivery duct and into or out of the enclosure. The frame may be used for delivering air to the room or exhausting air from the room.
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 September 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
- 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.