Dust digger
CA 2059262 A1 · Owner: Modrall, Ryan R. · Inventors: Modrall, Ryan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Page 2, ABSTRACT, A vacuum cleaner is known to pick up sand dust and debris, through a process of air movements lifting up dirt. There is currently no know way to be sure that an area of rug is clean, contains dust and dirt or even if the vacuum is picking anything up. In this invention, an audio sensor crystal is used to collect the energy waves of dirt particles that are rebounding from points within the vacuum system where the flow of air changes direction. The inertia of the moving dirt causes it to impact on a wall of a bend. These impacts release small energy waves that can be picked up by a sensor crystal placed at this bend and directed into supporting electronic circuitry that in …
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 January 13, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2014.
- 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.