Dust control device
CA 2214048 A1 · Owner: Parsons, David R. · Inventors: Parsons, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a dust retaining and filtering device which can be attached to a dust generating tool for controlling, the spread of dust and other particulate matter generated by grinding, sanding, polishing, burnishing and buffing devices. The device comprises a resilient skirt which curves outwardly along its bottom edge; a filter extending along the length of the skirt; means for mounting the filter along the length of the skirt and attachment means for securing the device to the dust generating tool.
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 August 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2019.
- 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.