US4293426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated calcium peroxide particles useful in the treatment of water
Assignee: Solvay Chimie SA
•
Filing: 1978-11-17
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Granted: 1981-10-06
•
Expires: 1998-11-17
Abstract
Abstract Solid particles containing calcium peroxide and coated with a coating agent containing a water-insoluble solid compound having a melting point of at least 50° C. The particles can be used in the treatment of water and make it possible to ensure sufficient oxygenation for very long periods.
Inventors
- 👤 Ignace Gago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:12
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C01; C01B; C01B15/00; C01B15/04; C01B15/043; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
55 words
Solid particles comprising calcium peroxide, and a coating agent coating the calcium peroxide, said coating agent being predominantly a water-insoluble solid compound which is an organic polymer or an inorganic compound, said water-insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C.
Claim 2
Dependent Claim
55 words
Solid particles comprising calcium peroxide, and a coating agent coating the calcium peroxide, said coating agent being predominantly a water-insoluble solid compound which is an organic polymer or an inorganic compound, said water-insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C.
Claim 3
Dependent Claim
31 words
Solid particles according to claim 1 wherein the polymer is a polymer containing monomeric units derived from monomers selected from the group consisting of substituted and unsubstituted mono- and poly-unsaturated olefines.
Claim 4
Dependent Claim
27 words
Solid particles according to claim 2 wherein the olefines are substituted by substituents selected from the group consisting of halogen atoms and alkyl, aryl and cycloalkyl groups.
Claim 5
Dependent Claim
14 words
Solid particles according to claim 3 wherein the substituents are chlorine or fluorine atoms.
Claim 6
Dependent Claim
31 words
Solid particles according to claim 1 wherein the polymer is a vinyl copolymer containing monomeric units derived from monomers selected from the group consisting of vinylidene chloride, styrene and vinyl chloride.
Claim 7
Dependent Claim
19 words
Solid particles according to claim 5 wherein the vinyl copolymer is a copolymer of vinylidene chloride with methyl acrylate.
Claim 8
Dependent Claim
24 words
Solid particles according to claims 1, 2, 3, 4, 5 or 6 wherein they contain from 0.1 to 20% by weight of coating agent.
Claim 9
Dependent Claim
27 words
Solid particles according to claims 1, 2, 3, 4, 5, or 6 wherein said coating agent is in the form of an outer layer of each particle.
Claim 10
Dependent Claim
24 words
Solid particles according to claim 1 wherein the inorganic compound is selected from the group consisting of phosphates, silicates, sulfates, aluminates, alumino-silicates, and carbonates.
Claim 11
Dependent Claim
13 words
Solid particles according to claim 9, wherein the inorganic compound comprises a phosphate.
Claim 12
Dependent Claim
19 words
Solid particles according to claim 10 wherein the phosphate is selected from the group consisting of tripolyphosphates and metaphosphates.
Claim 13
Dependent Claim
20 words
Solid particles according to claim 1 which comprise a plurality of fine calcium peroxide particles agglomerated by the coating agent.
Claim 14
Dependent Claim
83 words
Process for the production of solid particles in a medium containing, the solid particles comprising calcium peroxide and a coating agent coating the calcium peroxide, said coating agent being predominantly a water insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C., comprising spraying a solution, emulsion or suspension of a composition forming the coating agent in a liquid medium onto moving calcium peroxide granules, and evaporating the liquid medium.
Claim 15
Dependent Claim
83 words
Process for the production of solid particles in a medium containing, the solid particles comprising calcium peroxide and a coating agent coating the calcium peroxide, said coating agent being predominantly a water insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C., comprising spraying a solution, emulsion or suspension of a composition forming the coating agent in a liquid medium onto moving calcium peroxide granules, and evaporating the liquid medium.
Claim 16
Dependent Claim
62 words
Process for the oxygenation of water, comprising treating each m 3 of water with 0.05 to 1,000 g of solid particles comprising calcium peroxide and a coating agent coating the calcium peroxide, said coating agent being predominantly a water insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C.
Claim 17
Dependent Claim
62 words
Process for the oxygenation of water, comprising treating each m 3 of water with 0.05 to 1,000 g of solid particles comprising calcium peroxide and a coating agent coating the calcium peroxide, said coating agent being predominantly a water insoluble solid compound having a solubility in water of less than 1% by weight and a melting point of at least 50° C.
Claim 18
Dependent Claim
31 words
A process according to claim 14, wherein the process is applied to the oxygenation of potable waters, in which the solid particles containing calcium peroxide are disposed in potable water filters.
Claim 19
Dependent Claim
18 words
A process according to claim 14, wherein the process is applied to the oxygenation of potable water reservoirs.
Claim 20
Dependent Claim
30 words
A process according to claim 14, wherein the process is applied to the oxygenation of waters containing a chlorination agent selected from the group consisting of chlorine and sodium hypochlorite.
Claim 21
Dependent Claim
17 words
A process according to claim 14, wherein the process is applied to the oxygenation of waste waters.
Claim 22
Dependent Claim
22 words
Process according to claim 14 wherein the solid particles comprise a plurality of fine calcium peroxide particles agglomerated by the coating agent.
Claim 23
Dependent Claim
20 words
Process according to claim 13 or 14 wherein the water insoluble compound is an organic polymer or an inorganic compound.
Claim 24
Dependent Claim
30 words
Process according to claim 20 wherein the polymer is a polymer containing monomeric units derived from monomers selected from the group consisting of substituted and unsubstituted mono- and poly-unsaturated olefines.
Claim 25
Dependent Claim
26 words
Process according to claim 21 wherein the olefines are substituted by substituents selected from the group consisting of halogen atoms and alkyl, aryl and cycloalkyl groups.
Claim 26
Dependent Claim
13 words
Process according to claim 22 wherein the substituents are chlorine or fluorine atoms.
Claim 27
Dependent Claim
30 words
Process according to claim 20 wherein the polymer is a vinyl copolymer containing monomeric units derived from monomers selected from the group consisting of vinylidene chloride, styrene and vinyl chloride.
Claim 28
Dependent Claim
18 words
Process according to claim 24 wherein the vinyl copolymer is a copolymer of vinylidene chloride with methyl acrylate.
Claim 29
Dependent Claim
19 words
Process according to claim 20, wherein the solid particles contain from 0.1 to 20% by weight of coating agent.
Claim 30
Dependent Claim
20 words
Process according to claim 20, wherein said coating agent is in the form of an outer layer of each particle.
Claim 31
Dependent Claim
23 words
Process according to claim 20 wherein the inorganic compound is selected from the group consisting of phosphates, silicates, sulfates, aluminates, alumino-silicates and carbonates.
Claim 32
Dependent Claim
12 words
Process according to claim 28 wherein the inorganic compound comprises a phosphate.
Claim 33
Dependent Claim
18 words
Process according to claim 29 wherein the phosphate is selected from the group consisting of tripolyphosphates and metaphosphates.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |