Process and device for obtaining unadulterated samples of water when sinking a well by drilling
CA 2033173 A1 · Owner: Grotendorst, Gerhard · Inventors: Grotendorst, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and device is used for producing uncontaminated water samples when drilling a well, using a hollow bar for transporting drilling fluid whose conduits consists of nonperforated tubes and at least one perforated tube; the water sample is pumped through filter sand from a water-conducting horizontal, approached by the boring bar via a perforated, conduit positioned in the latter after the filter sand is deposited between the perforated conduit the adjacent, nonperforated conduit and the bore wall and incorporated into the system as a filter; according to the invention the bore up to, the first water-conducting horizontal is drilled with the closed perforated conduit and the first …
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 May 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.