Fire-fighting foams and methods of producing the same

Claim 1

AN AQUEOUS FROM CONCENTRATE ADAPTED TO BE TRANSFORMED BY MIXING WITH WATER AND AGITATION INTO A FOAM FOR FIRE-FIGHTING PURPOSES AND BEING PARTICULARLY SUITABLE AGAINST BURNING OF INFLAMMABLE LIQUIDS WHICH ARE AT LEAST PARTLY WATER-SOLUBLE, SAID AQUEOUS FROM CONCENTRATE CONSISTING ESSENTIALLY OF WATER, AT LEAST ONE WATER-SOLUBLE DERIVATIVE OF ALIGNIC ACID, A WATER-SOLUBLE ELECTROLYTE WHICH DOES NOT REACT WITH SAID WATER-SOLUBLE DERIVATIVE OF ALIGNIC ACID TO FORM A WATER-INSOLUBLE DERIVATIVE THEREOF, AND A FOAM-FORMING AGENT FOR FIRE-FIGHTING PURPOSES NON-CHEMICALLY REACTIVE WITH SAID WATER-SOLUBLE ALGINIC ACID DERIVATIVE AND WITH SAID WATER-SOLUBLE ELECTROLYTE AND BEING DISSOLVED IN SAID WATER IN AN AMOUNT SUFFICIENT TO CAUSE FORMATION OF A FOAM WHEN DILUTED WITH A PREDETERMINED AMOUNT OF WATER AND MECHANICALLY AGITATED THEREWITH, SAID WATER-SOLUBLE ELECTROLYTE BEING PRESENT IN AN AMOUNT SUFFICIENT ON THE ONE HAND TO CAUSE SALTING-OUT OF SAID WATER-SOLUBLE DERIVATIVE OF ALGINIC ACID IN SAID AQUEOUS FOAM CONCENTRATE AND INSUFFICIENT ON THE OTHER HAND TO PREVENT DISSOLUTION OF SAID WATER-SOLUBLE DERIVATIVE OF ALIGNIC ACID WHEN SAID AQUEOUS FOAM CONCENTRATE IS DILUTED WITH SAID PREDETERMINED AMOUNT OF WATER, WHEREBY UPON FORMATION OF A FOAM BY DILUTION AND AGITATION OF SAID AQUEOUS FOAM CONCENTRATE WITH SAID PREDETERMINED AMOUNT OF WATER THE FOAM BUBBLES ARE STABLIZED AGAINST THE ACTION OF WATER-SOLUBLE INFLAMMABLE BY SAID ALIGIN-ACID DERIVATIVE IN CONTACT WITH THE FOAM BUBBLES.