Rust stain removal formula
AssigneeIron Out, Inc.
InventorRobert F. Crist
Life of this patent
Estimating the term…
Abstract
A rust stain removal formula using fluoboric acid as the active ingredient and a method of making same. The inventive formula does not etch glazed, glass or enamel surfaces to which the formula is applied. Further, the inventive formula reduces other problems caused by the hydrofluoric acid used as the active ingredient in prior art rust stain removal formulas. The formula is initially formed by adding ammonium bifluoride, and then boric acid to a solution of heated water. Oxalic acid is then added. The ammonium bifluoride reacts with the boric acid to form fluoboric acid. Optional ingredients such as a thickener and perfume may also be included in the inventive rust stain removal formula.
Claims21
A composition for removal of rust stains, said composition comprising:
- about 1 to 5 percent by weight of ammonium bifluoride;
- about 1 to 5 percent by weight of boric acid;
- about 1 to 5 percent by weight of oxalic acid;
- and
- fluoboric acid, said fluoboric acid formed by reaction of said ammonium bifluoride with said boric acid;
- the remainder of said composition being substantially water and, optionally, one or both of a surfactant and a thickening agent.
A composition for removal of rust stains, said composition consisting essentially of:
- about 1 to 5 percent by weight of ammonium bifluoride;
- about 1 to 5 percent by weight of boric acid;
- about 1 to 5 percent by weight of oxalic acid;
- and
- the remainder of said composition being substantially water and, optionally, one or both of a surfactant and a thickening agent;
- whereby said ammonium bifluoride and said boric acid react in said composition to form fluoboric acid.
A method of treating rust stains comprising the following steps:
- (a) combining a predetermined amount of ammonium bifluoride with water in a container and dissolving the ammonium bifluoride;
- (b) after step (a), adding a predetermined amount of boric acid to the container;
- (c) mixing the contents of the container, whereby the boric acid and the ammonium bifluoride react to form a formula including fluoboric acid;
- and
- (d) applying the formula to an article having a rust stain thereon, said formula removing at least a portion of the rust stain.
A method of forming a rust stain removal formula comprising the following steps:
- (a) adding a thickener to a container having water therein;
- (b) adding a predetermined amount of ammonium bifluoride to the container;
- (c) after step (b), adding a predetermined amount of boric acid to the container, the boric acid reacting with the ammonium bifluoride to form fluoboric acid;
- and
- (d) after step (c), adding predetermined amounts of oxalic acid and optionally, citric acid.
Dependencies are inferred from the claim text.