US5445945A
Expired / Lapsed
US
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Methods of regenerating metalworking fluids with chelating agents
Assignee: Torrington Co Ltd
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Filing: 1994-02-28
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Granted: 1995-08-29
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Expires: 2014-02-28
Abstract
Abstract Metalworking fluids (MWFs) can be regenerated and stabilized by the controlled addition of a chelating agent. The resulting sequestration of the dissolved metals in the MWF has been found to reduce incidence of dermatitis, to control the growth of microbes including bacteria and fungi, and to reduce the generation of odors, all without the further addition of fresh (virgin) MWF or a conventional biocide.
Inventors
- 👤 Peter H. Drechsler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:00
CPC Classifications
A; A01; A01N; A01N37/00; A01N37/44; C; C10; C10M; C10M175/00; C10M175/0016; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/04; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
97 words
A method for reducing the presence of at least one detrimental microbe in a metalworking fluid (MWF), comprising: (A) testing a metalworking fluid for the presence of said at least one microbe and the presence of at least one type of free metal ion in solution; (B) determining the concentration of said free metal ion in solution in said metalworking fluid; and (C) when said at least one microbe and said at least one metal ion are both present, adding to said metalworking fluid an amount of a chelating agent effective to sequester said free metal ion.
Claim 2
Independent Claim
97 words
A method for reducing the presence of at least one detrimental microbe in a metalworking fluid (MWF), comprising: (A) testing a metalworking fluid for the presence of said at least one microbe and the presence of at least one type of free metal ion in solution; (B) determining the concentration of said free metal ion in solution in said metalworking fluid; and (C) when said at least one microbe and said at least one metal ion are both present, adding to said metalworking fluid an amount of a chelating agent effective to sequester said free metal ion.
Claim 3
Dependent Claim
52 words
The method as defined by claim 1, wherein said chelating agent effective to sequester said metal ion is selected from the group consisting of dimercaprol(2,3-dimercaptopropanol), ethylenediamine tetraacetic acid (EDTA), diethylenetriamine pentaacetic acid (DTPA), penicillamine(β,β-dimethylcysteine), deferoxamine, triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), gluconic acid, salts thereof, derivatives thereof, and mixtures thereof.
Claim 4
Dependent Claim
47 words
The method as defined by claim 1, wherein said chelating agent effective to sequester said metal ion is an acetic acid derivative selected from the group consisting of diethylenetriamine pentaacetic acid (DTPA), triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), salts thereof, derivatives thereof, and mixtures thereof.
Claim 5
Dependent Claim
29 words
The method as defined by claim 1, wherein said metal ion is selected from the group consisting of iron, nickel, chromium, cobalt, cadmium, copper, manganese, zinc, and mixtures thereof.
Claim 6
Dependent Claim
15 words
The method as defined by claim 1, wherein said steps (A) and (B) are automated.
Claim 7
Dependent Claim
13 words
The method as defined by claim 1, wherein said step (C) is automated.
Claim 8
Dependent Claim
16 words
The method as defined by claim 1, wherein said metalworking fluid is a synthetic metalworking fluid.
Claim 9
Dependent Claim
16 words
The method as defined by claim 1, wherein said metalworking fluid is a semi-synthetic metalworking fluid.
Claim 10
Dependent Claim
15 words
The method as defined by claim 1, wherein said metalworking fluid is a water-soluble oil.
Claim 11
Dependent Claim
27 words
The method as defined by claim 1, further comprising, at some time subsequent to said adding of said chelating agent, repeating said steps (A), (B), and (C).
Claim 12
Independent Claim
81 words
A method for reducing the occurrence of dermatitis induced by the composition of a used metalworking fluid, comprising: (A) testing a used metalworking fluid for the presence of free metal ions in solution; (B) determining the concentration of said ions in solution in said fluid; and, (C) adding to said metalworking fluid an amount of a chelating agent effective to sequester said free metal ions and thereby reducing the occurrence of dermatitis induced by the composition of said used metalworking fluid.
Claim 13
Independent Claim
81 words
A method for reducing the occurrence of dermatitis induced by the composition of a used metalworking fluid, comprising: (A) testing a used metalworking fluid for the presence of free metal ions in solution; (B) determining the concentration of said ions in solution in said fluid; and, (C) adding to said metalworking fluid an amount of a chelating agent effective to sequester said free metal ions and thereby reducing the occurrence of dermatitis induced by the composition of said used metalworking fluid.
Claim 14
Dependent Claim
52 words
The method as defined by claim 11, wherein said chelating agent effective to sequester said metal ions is selected from the group consisting of dimercaprol(2,3-dimercaptopropanol), ethylenediamine tetraacetic acid (EDTA), diethylenetriamine pentaacetic acid (DTPA), penicillamine(β,β-dimethylcysteine), deferoxamine, triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), gluconic acid, salts thereof, derivatives thereof, and mixtures thereof.
Claim 15
Dependent Claim
47 words
The method as defined by claim 11, wherein said chelating agent effective to sequester said metal ions is an acetic acid derivative selected from the group consisting of diethylenetriamine pentaacetic acid (DTPA), triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), salts thereof, derivatives thereof, and mixtures thereof.
Claim 16
Dependent Claim
29 words
The method as defined by claim 11, wherein said metal ions are selected from the group consisting of iron, nickel, chromium, cobalt, cadmium, copper, manganese, zinc, and mixtures thereof.
Claim 17
Dependent Claim
15 words
The method as defined by claim 11, wherein said steps (A) and (B) are automated.
Claim 18
Dependent Claim
13 words
The method as defined by claim 11, wherein said step (C) is automated.
Claim 19
Dependent Claim
16 words
The method as defined by claim 11, wherein said metalworking fluid is a synthetic metalworking fluid.
Claim 20
Dependent Claim
16 words
The method as defined by claim 11, wherein said metalworking fluid is a semi-synthetic metalworking fluid.
Claim 21
Dependent Claim
15 words
The method as defined by claim 11, wherein said metalworking fluid is a water-soluble oil.
Claim 22
Dependent Claim
27 words
The method as defined by claim 11, further comprising, at some time subsequent to said addition of said chelating agent, repeating said steps (A), (B), and (C).
Claim 23
Independent Claim
57 words
A method for regenerating a used metalworking fluid, comprising: (A) testing a used metalworking fluid for the presence of metal ions; (B) determining the concentration and types of said ions present; and, (C) adding to said metalworking fluid an amount of a chelating agent effective to sequester said metal ions and thereby regenerating said used metalworking fluid.
Claim 24
Independent Claim
57 words
A method for regenerating a used metalworking fluid, comprising: (A) testing a used metalworking fluid for the presence of metal ions; (B) determining the concentration and types of said ions present; and, (C) adding to said metalworking fluid an amount of a chelating agent effective to sequester said metal ions and thereby regenerating said used metalworking fluid.
Claim 25
Dependent Claim
16 words
The method as defined by claim 21, wherein said metalworking fluid is a synthetic metalworking fluid.
Claim 26
Dependent Claim
16 words
The method as defined by claim 21, wherein said metalworking fluid is a semi-synthetic metalworking fluid.
Claim 27
Dependent Claim
15 words
The method as defined by claim 21, wherein said metalworking fluid is a water-soluble oil.
Claim 28
Dependent Claim
27 words
The method as defined by claim 21, further comprising, at some time subsequent to said addition of said chelating agent, repeating said steps (A), (B), and (C).
Claim 29
Dependent Claim
52 words
The method as defined by claim 21, wherein said chelating agent effective to sequester said metal ions is selected from the group consisting of dimercaprol(2,3-dimercaptopropanol), ethylenediamine tetraacetic acid (EDTA), diethylenetriamine pentaacetic acid (DTPA), penicillamine(β,β-dimethylcysteine), deferoxamine, triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), gluconic acid, salts thereof, derivatives thereof, and mixtures thereof.
Claim 30
Dependent Claim
47 words
The method as defined by claim 21, wherein said chelating agent effective to sequester said metal ions is an acetic acid derivative selected from the group consisting of diethylenetriamine pentaacetic acid (DTPA), triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), salts thereof, derivatives thereof, and mixtures thereof.
Claim 31
Dependent Claim
29 words
The method as defined by claim 21, wherein said metal ions are selected from the group consisting of iron, nickel, chromium, cobalt, cadmium, copper, manganese, zinc, and mixtures thereof.
Claim 32
Dependent Claim
15 words
The method as defined by claim 21, wherein said testing and determining steps are automated.
Claim 33
Dependent Claim
13 words
The method as defined by claim 21, wherein said adding step is automated.
Claim 34
Independent Claim
70 words
A method for reducing the presence of one or more microbes in a metalworking fluid, which comprises: (A) determining whether undesirable microbes exist in said metalworking fluid; and, (B) if such undesirable microbes exist, adding to said metalworking fluid an amount of a chelating agent effective to sequester metal ions which are microbial nutrients therein and thereby reducing the presence of said one or more microbes in said metalworking fluid.
Claim 35
Independent Claim
70 words
A method for reducing the presence of one or more microbes in a metalworking fluid, which comprises: (A) determining whether undesirable microbes exist in said metalworking fluid; and, (B) if such undesirable microbes exist, adding to said metalworking fluid an amount of a chelating agent effective to sequester metal ions which are microbial nutrients therein and thereby reducing the presence of said one or more microbes in said metalworking fluid.
Claim 36
Dependent Claim
31 words
The method as defined by claim 31, wherein said undesirable microbes include at least one bacteria selected from the group consisting of those of the genera Pseudomonas, Legionella, Desulfovibrio, and Acinetobacter.
Claim 37
Dependent Claim
29 words
The method as defined by claim 31, wherein said undesirable microbes include at least one yeast selected from the group consisting of those of the genera Fusarium, and Candida.
Claim 38
Dependent Claim
52 words
The method as defined by claim 31, wherein said chelating agent effective to sequester said metal ions is selected from the group consisting of dimercaprol(2,3-dimercaptopropanol), ethylenediamine tetraacetic acid (EDTA), diethylenetriamine pentaacetic acid (DTPA), penicillamine(β,β-dimethylcysteine), deferoxamine, triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), gluconic acid, salts thereof, derivatives thereof, and mixtures thereof.
Claim 39
Dependent Claim
48 words
The method as defined by claim 31, wherein said chelating agent effective to sequester said metal ions is an acetic acid derivative selected from the group consisting of diethylenetriamine pentaacetic acid (DTPA) , triethylenetetraamine hexaacetic acid (TTHA), tetraethylenepentaamine heptaacetic acid (PHA), salts thereof, derivatives thereof, and mixtures thereof.
References Cited (Backward Citations)
GB1476862A
Cited
US4853131A
Cited
US4129509B1
Cited
US4129509A
Cited
US4172140A
Cited
US4250046A
Cited
US4294853A
Cited
US4307109A
Cited
US4406812A
Cited
CA1161026A
Cited
US4828730A
Cited
US4927550A
Cited
US5160527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |