An apparatus for pneumatically discharging concrete
CA 2000952 A1 · Owner: Friedrich Wilh. Schwing Gmbh · Inventors: Von Eckardstein, Karl-Ernst; Coja, Joachim; Simnovec, Andrej
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an apparatus for pneumatically discharging concrete fed hydromechanically in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with opposed pistons, said pump having synchronization control by a displacer circuit conducting the working medium displaced by a piston and having, a dosing means for an additive serving as an accelerating agent whose, drive is connected to the hydraulic circuit of the concrete pump drive the inventive proposal is that the drive (34-37) of the dosing means (43- 47; 60-70) is connected to the displacer circuit (31) and designed as a reciprocating piston drive (34) whose absorption amount …
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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 October 18, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.