Patents by Inventor Giuseppe Bruzzone

Giuseppe Bruzzone has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of alkaline chromates from chromium minerals
    Patent number: 5374408
    Abstract: A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative disaggregation is carried out in dry phase by moving the mixture within the reactor while heating the mixture by indirect heat exchange in the absence of combustion gases and under mechanical stress, and feeding to the interior of the reactor oxidizing gas. The mixture is heated to a temperature of between 500.degree. and 1500.degree. C. The oxidizing gas is fed with an oxygen concentration in a range between 8 and 100%. Gases leaving the reactor are used for the acidification of an aqueous solution of alkaline chromates which is then dried and supplied to the reactor. The reactor is a rotating tubular reactor and the mixture moves continuously through the rotating reactor.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: December 20, 1994
    Assignee: Luigi Stoppani S.P.A.
    Inventors: Giuseppe Bruzzone, Diego Perrone, Alfredo Parodi
  • Process for recovering chromic anhydride from exhausted aqueous chromium plating bath solutions with exploitation of the recovered chromium
    Patent number: 5112583
    Abstract: The chromic anhydride contained in soluble form (chromic acid) in exhausted, polluted chromium plating baths is recovered by alkalizing the exhausted chromium plating liquid to a pH comprised between 3 and 7 at a temperature of 70.degree. C. with a commercial sodium hydroxide solution, keeping the mass in reaction at this temperature for an hour and filtration separating the precipitate obtained. The filtered solution having a specific gravity of 1.25 kg/l, contains CrO.sub.3 (22% in weight) which is then reduced with sulphur dioxide to obtain a solution containing basic chromium sulphate and sodium sulphate, suitable for use as a tanning bath; in this manner pollution is avoided and the waste chromium is exploited. The solution containing CrO.sub.3 can also be introduced into a hexavalent chromium salt production cycle.
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: May 12, 1992
    Assignee: Luigi Stoppani S.p.A.
    Inventors: Giuseppe Bruzzone, Giovanni Ghelli, Diego Perrone
  • Product capable of inhibiting the corrosion of the reinforcements present in concrete or cement mortar and related process
    Patent number: 5110360
    Abstract: Chromite by-products having a composition which includes FeCr.sub.2 O.sub.4 as well as iron, aluminum, magnesium, sodium, calcium and silicon oxides are directly mixed with cement mortar and with the aggregates on use, or added to the water, producing the effect of corrosion inhibition of the steel reinforcements.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: May 5, 1992
    Assignee: Luigi Stoppani S.p.A.
    Inventors: Giuseppe Bruzzone, Diego Perrone, Alessandro Sperati