US4564465A — Corrosion inhibition additive for fluid condition…

Claim 1

Independent Claim 47 words

A corrosion inhibitor for addition to the cooling fluid in a fluid circulating cooling system, comprising: an additive of a soluble alkali metal salt of perchlorate in solution with said fluid in a concentration in the range of 100 to 1000 ppm and forming ions of perchlorate.

Claim 2

Dependent Claim 47 words

A corrosion inhibitor for addition to the cooling fluid in a fluid circulating cooling system, comprising: an additive of a soluble alkali metal salt of perchlorate in solution with said fluid in a concentration in the range of 100 to 1000 ppm and forming ions of perchlorate.

Claim 3

Dependent Claim 23 words

A corrosion inhibitor as set forth in claim 1 wherein: said additive is sodium perchlorate monohydrate in concentration of at least 100 ppm.

Claim 4

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 1 which further includes: a second additive placing nitrate ion in solution in concentration of at least 100 ppm.

Claim 5

Dependent Claim 16 words

A corrosion inhibitor as set forth in claim 3 wherein: said second additive is sodium nitrate.

Claim 6

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 3 which further includes: a third additive placing silicate ion in solution in concentration of at least 200 ppm.

Claim 7

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 1 which further includes: a second additive placing silicate ion in solution in concentration of at least 200 ppm.

Claim 8

Dependent Claim 18 words

A corrosion inhibitor as set forth in claim 5 which further includes: at least one chelating agent additive.

Claim 9

Dependent Claim 31 words

A corrosion inhibitor as set forth in claim 5 which further includes: a buffering agent adjusting pH value of the additive solution to a basic value in the range of 7-11.

Claim 10

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 5 which further includes: an additive of tolytriazole in concentration within a range of 100 ppm to 400 ppm.

Claim 11

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 5 which further includes: an additive of benzotriazole in concentration within a range of 100 ppm to 400 ppm.

Claim 12

Dependent Claim 27 words

A corrosion inhibitor as set forth in claim 5 which further includes: an additive of 2-mercaptobenzothiazole in concentration within a range of 100 ppm to 1000 ppm.

Claim 13

Dependent Claim 22 words

A corrosion inhibitor as set forth in claim 5 which further includes: a cation-ion exchange resin in concentration to control solution hardness.

Claim 14

Independent Claim 39 words

A method of inhibiting the corrosion of system structural metals in cooling systems utilizing circulating fluid coolant comprising: adding perchlorate ion in solution with said fluid coolant at a concentration in the range from 100 ppm to 1000 ppm.

Claim 15

Independent Claim 39 words

A method of inhibiting the corrosion of system structural metals in cooling systems utilizing circulating fluid coolant comprising: adding perchlorate ion in solution with said fluid coolant at a concentration in the range from 100 ppm to 1000 ppm.

Claim 16

Dependent Claim 31 words

A method as set forth in claim 13 further includes: adding nitrate ion in solution with said fluid coolant at a concentration in the range from 200 ppm to 2000 ppm.

Claim 17

Dependent Claim 32 words

A method as set forth in claim 13 which further includes: adding silicate ion in solution with said fluid coolant at a concentration in the range from 300 ppm to 600 ppm.

Claim 18

Dependent Claim 31 words

A method as set forth in claim 14 further includes: adding silicate ion in solution with said fluid coolant at a concentration in the range from 300 ppm to 600 ppm.

Claim 19

Dependent Claim 63 words

An aqueous solution for use as a non-corroding circulating fluid in a fluid system which may include any of iron, steel, aluminum, copper, brass, solder and other metal structural components, comprising: water; and a perchlorate salt of an alkali metal contributing perchlorate ions in an amount within the range of 0.10 grams to 5 grams in solution per each liter amount of water.

Claim 20

Dependent Claim 63 words

An aqueous solution for use as a non-corroding circulating fluid in a fluid system which may include any of iron, steel, aluminum, copper, brass, solder and other metal structural components, comprising: water; and a perchlorate salt of an alkali metal contributing perchlorate ions in an amount within the range of 0.10 grams to 5 grams in solution per each liter amount of water.

Claim 21

Dependent Claim 43 words

An aqueous solution as set forth in claim 17 which further comprises: nitrate salt of the group including alkali and alkaline earth metals in an amount within the range of 0.5 grams to 10 grams in solution per each liter amount of water.

Claim 22

Dependent Claim 37 words

An aqueous solution as set forth in claim 17 which further comprises: an alkali metal silicate salt in an amount within the range of 0.5 grams to 5 grams in solution per each liter amount of water.

Claim 23

Dependent Claim 60 words

An aqueous solution for use as a non-corroding circulating fluid in a fluid system which may include any of iron, steel, aluminum, copper, brass, solder, and other metal structural components, comprising: water; and an anion-ion exchange resin contributing perchlorate ions in an amount within the range of 0.10 grams to 10 grams in solution per each liter amount of water.

Claim 24

Dependent Claim 60 words

An aqueous solution for use as a non-corroding circulating fluid in a fluid system which may include any of iron, steel, aluminum, copper, brass, solder, and other metal structural components, comprising: water; and an anion-ion exchange resin contributing perchlorate ions in an amount within the range of 0.10 grams to 10 grams in solution per each liter amount of water.

Claim 25

Independent Claim 53 words

A method of effecting corrosion protection to iron and steel system components that come in contact with the fluid in a fluid circulation system, comprising: adding to the fluid an amount of perchlorate ion sufficient to effect formation of a protective mixed oxide coating of FeO.Fe 2 O 3 on said system components.

Claim 26

Independent Claim 53 words

A method of effecting corrosion protection to iron and steel system components that come in contact with the fluid in a fluid circulation system, comprising: adding to the fluid an amount of perchlorate ion sufficient to effect formation of a protective mixed oxide coating of FeO.Fe 2 O 3 on said system components.

Claim 27

Dependent Claim 37 words

A method as set forth in claim 21 wherein said step of adding comprises: placing in solution with said fluid an effective amount of a perchlorate salt as selected from the alkali and akaline-earth metal salts thereof.

Claim 28

Dependent Claim 33 words

A method as set forth in claim 21 wherein said step of adding comprises: placing in said fluid a selected amount of an anion-ion exchange resin bearing said perchlorate ion in attractive association.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-01-13	1989-07-15	1990-01-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-01-13	1993-07-15	1994-01-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-01-13	1997-07-15	1998-01-14	$7700.00	Window Closed / Lapsed

Corrosion inhibition additive for fluid conditioning

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