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US 4,306,814 AGranted
Apparatus for mixing concrete
OwnerVittorio Magniinventor
Life of this patent
Estimating the term…
Abstract
A concrete mixing apparatus comprises a mixing vessel at the bottom of which a plurality of heated steam injectors are arranged, the opening and closing whereof are controlled by valves slaved to actuating means.
Claims6
An apparatus for mixing concrete, characterized in that it comprises a concrete mixing vessel, a plurality of injectors communicating with the vessel inside and arranged at the bottom thereof, means for connecting said injectors to a steam source, valve means controlling the opening and closing of said injectors, and actuating means controlling the opening and closing of said valve means.
Dependencies are inferred from the claim text.