Patents by Inventor Antonio Crispoldi

Antonio Crispoldi 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 producing calcium nitrate-urea adduct
    Patent number: 5716591
    Abstract: Calcium nitrate-urea adduct, a product having the formula ?Ca(NO.sub.3).sub.2.4CO(NH.sub.2).sub.2 !, is obtained by means of a process which basically consists of the following steps:mixing molten urea and calcium nitrate;feeding the resulting solution to a turbodryer;feeding the resulting molten salt to a granulator drum;recovery of calcium nitrate-urea adduct.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: February 10, 1998
    Assignee: Nuova Terni Industrie Chimiche S.p.A.
    Inventor: Antonio Crispoldi
  • Calcium and magnesium based nitrogen fertilizer, process and eqiupment for its production
    Patent number: 5435823
    Abstract: A fertilizer containing Ca, Mg and NH.sub.4 4, having a water content ranging between 15% and 35% in weight and a melting point ranging between 50 and 65 degrees C is prepared by etching of dolomite and/or limestone with nitric acid, neutralization, concentration and granulation (FIG. 1).
    Type: Grant
    Filed: April 21, 1993
    Date of Patent: July 25, 1995
    Assignee: Terni Industrie Chimiche S.p.A.
    Inventor: Antonio Crispoldi
  • Process for producing calcium-urea nitrate
    Patent number: 4874595
    Abstract: Calcium-urea nitrate [Ca(NO.sub.3).sub.2.4CO(NH.sub.2).sub.2 ] is produced by means of a process, according to which:a liquid composition is prepared, at a temperature not higher than 170.degree. C., which contains urea and calcium nitrate, in a molar ratio to each other equal to, or approximately equal to, 4/1, and having a water content comprised within the range of from 0 to 15% by weight;said liquid composition is sprayed, through a spray nozzle, on previously formed solid particles of calcium-urea nitrate, kept moving at a temperature comprised within the range of from 40.degree. to approximately 100.degree. C., and under a stream of an inert gas;calcium-urea nitrate is recovered from said solid products from the spray.The so obtained calcium-urea nitrate is in the form of a granular and free-flowing solid, free from the tendency to form dusts, and is useful in agriculture as a nitrogenous fertilizer.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: October 17, 1989
    Assignees: Enichem Agricoltura S.p.A., CCM S.r.l., Tecnocentro S.r.l.
    Inventors: Antonio Crispoldi, Andrea Moriconi, Mario Chiappafreddo