Device for cleaning a sewer
CA 2035858 A1 · Owner: Dinkelacker, Albrecht · Inventors: Dinkelacker, Albrecht
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Device for cleaning a sewer of a kind which under the action of, the flowing sewage is carried along the sewer by the sewage with a velocity minor to the average velocity of sewage flow and which comprises a hollow cleaning ball immersing into the sewage and rolling on the bed or ceiling of the sewer. The outer surface of the cleaning ball having protrusions the outer, surface of the protrusions lying on an imaginary spherical surface. For adapting the effective weight of the cleaning ball to different levels of sewage in the sewer several water through-holes are distributed on the spherical wall of the cleaning ball which open into a sewage space within the hollow cleaning ball at a wall …
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 February 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 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.