Patents by Inventor Regis Stana

Regis Stana 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).

  • Automatic control system for phosphoric acid plant
    Patent number: 5262963
    Abstract: An improved automatic control system for controlling a phosphoric acid plant in order to maximize recovery of phosphoric acid which includes a programmable computer, a rock flow control and measurement device for controlling and measuring the rock mass flow rate, an acid flow control and measurement device for measuring and controlling the sulfuric acid feed rate, wherein the computer is programmed to calculate the total amount of sulfuric acid added to the reactor, calculate the total amount of rock added to the reactor, over the time interval, calculate a new sulfuric acid feed point to make excess sulfate resulting from reaction of incoming acid and rock to have a predetermined excess sulfate, wherein the predetermined excess sulfate causes the phosphoric acid plant to operate at the maximum efficiency, calculate a number of gallons of sulfuric acid to be added or subtracted to the reactor to correct the excess sulfate of material already in the reactor, and to generate control signals to cause said sulfur
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: November 16, 1993
    Assignee: IMC Fertilizer, Inc.
    Inventors: Regis Stana, Stephen W. Hilakos