Patent US6061452A successfully refreshed from Google Patents.
US3887482A
Expired / Lapsed
US
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Compositions for floridating drinking water
Assignee: Boliden AB
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Filing: 1973-10-09
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Granted: 1975-06-03
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Expires: 1993-10-09
Abstract
Abstract The invention provides for a composition based on crystallized aluminium sulphate and containing a fluorine compound selected from the group consisting of NaF, HF, H2SiF6, Na2SiF6, (NH4)2SiF6 and Na3AlF6 in an amount corresponding to 0.5 - 5 percent by weight of fluorine based on the weight of the composition, homogenously distributed therethrough. The composition is useful for purifying municipal water by flocculation while adding fluorine to form drinking water resulting in reduced dental caries. The invention also refers to precesses for preparing said composition and to a method of treating crude water to form drinking water containing fluorine.
Inventors
- 👤 Carl-Johan Sigvard Hellestam
- 👤 Karl-Axel Melkersson
- 👤 Rolf Olof Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766; A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/20; A61K8/21; A61Q; A61Q11/00; C02F1/50; C02F1/505; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A COMPOSITION FOR USE IN ADDING FLUORINE TO DRINKING WATER FOR PURPOSE OF REDUCING DENTAL CARIES WHEN USING SAID WATER, SUCH ADDITION OF FLUORINE BEING CARRIED OUT IN CONNECTION WITH PURIFICATION OF CRUDE WATER TOO FORM DRINKING WATER BY FLOCCULATION WITH ALUMINIUM SULPHATE, SEDIMENTATION AND FILTRATION, COMPRISING CRYSTALLIZED ALUMINIUM SULPHATE AND HOMOGENEOUSLY DISTRIBUTED THERETHROUGH, A FLORINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF NAF, H2SIF6, NA2SIF6, (NH4)2SIF AND NA3ALF6 IN AN AMOUNT CORRESPONDING TO 0.5 - 5 PERCENT BY WEIGHT OF FLUORINE BASED ON THE WEIGHT OF THE COMPOSITION.
Claim 2
Dependent Claim
89 words
A COMPOSITION FOR USE IN ADDING FLUORINE TO DRINKING WATER FOR PURPOSE OF REDUCING DENTAL CARIES WHEN USING SAID WATER, SUCH ADDITION OF FLUORINE BEING CARRIED OUT IN CONNECTION WITH PURIFICATION OF CRUDE WATER TOO FORM DRINKING WATER BY FLOCCULATION WITH ALUMINIUM SULPHATE, SEDIMENTATION AND FILTRATION, COMPRISING CRYSTALLIZED ALUMINIUM SULPHATE AND HOMOGENEOUSLY DISTRIBUTED THERETHROUGH, A FLORINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF NAF, H2SIF6, NA2SIF6, (NH4)2SIF AND NA3ALF6 IN AN AMOUNT CORRESPONDING TO 0.5 - 5 PERCENT BY WEIGHT OF FLUORINE BASED ON THE WEIGHT OF THE COMPOSITION.
Claim 3
Dependent Claim
90 words
A composition for use in adding fluorine to drinking water for the purpose of reducing dental caries when using said water, such addition of fluorine being carried out in connection with purification of crude water to form drinking water by flocculation with aluminium sulphate, sedimentAtion and filtration, comprising crystallized aluminium sulphate and homogeneously distributed therethrough, a fluorine compound selected from the group consisting of NaF, H2SiF6, Na2SiF6, (NH4)2SiF6 and Na3AlF6 in an amount corresponding to 0.5 - 5 percent by weight of fluorine based on the weight of the composition.
Claim 4
Dependent Claim
90 words
A composition for use in adding fluorine to drinking water for the purpose of reducing dental caries when using said water, such addition of fluorine being carried out in connection with purification of crude water to form drinking water by flocculation with aluminium sulphate, sedimentAtion and filtration, comprising crystallized aluminium sulphate and homogeneously distributed therethrough, a fluorine compound selected from the group consisting of NaF, H2SiF6, Na2SiF6, (NH4)2SiF6 and Na3AlF6 in an amount corresponding to 0.5 - 5 percent by weight of fluorine based on the weight of the composition.
Claim 5
Dependent Claim
27 words
A composition according to claim 1 wherein at least 20 percent of the fluorine of the composition originates from a compound selected from H2SiF6, Na2SiF6 and (NH4)2SiF6.
Claim 6
Dependent Claim
12 words
A composition according to claim 1, wherein said fluorine compound is Na3AlF6.
Claim 7
Dependent Claim
32 words
A composition according to claim 1, wherein said fluorine compound is present in an amount corresponding to 1 - 3 percent by weight of fluorine based on the weight of the composition.
Claim 8
Dependent Claim
31 words
A composition according to claim 1, wherein said fluorine compound is present in an amount corresponding to about 2 percent by weight of fluorine based on the weight of the composition.
Claim 9
Dependent Claim
82 words
A process for preparing the composition of claim 1, comprising preparing an aqueous solution or melt of aluminium sulfate, adding a predetermined amount of a fluorine compound selected from the group consisting of NaF, H2SiF6, Na2SiF6, (NH4)2SiF6 and Na3AlF6 to said solution or melt, and crystallizing out an aluminium sulphate composition having said fluorine compound homogeneously distributed through the mass of the composition in an amount of 0.5 - 5 percent by weight of fluorine based on the weight of the composition.
Claim 10
Dependent Claim
28 words
A process according to claim 6, wherein at least 20 percent of the fluorine of the composition originates from a compound selected from H2SiF6, Na2SiF6 and (NH4)2 SiF6.
Claim 11
Dependent Claim
12 words
A process according to claim 6, wherein said fluorine compound is Na3AlF6.
Claim 12
Dependent Claim
85 words
A process for preparing the compound of claim 1, comprising digesting an aluminium bearing material in concentrated sulphuric acid in an amount such that the molar ratio of Al to SO4 is slightly in excess of 2:3 while adding said fluorine compound to form an aluminium solution or melt, and crystallizing out an aluminium sulphate composition having said fluorine compound homogeneously distributed through the mass of the composition in an amount of 0.5-5 percent by weight of fluorine based on the weight of the composition.
Claim 13
Dependent Claim
28 words
A process according to claim 9, wherein at least 20 percent of the fluorine of the composition originates from a compound selected from H2SiF6, Na2SiF6, and (NH4)2 SiF6.
References Cited (Backward Citations)
US2643179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |