US4002434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of abrasion resistant perborate monohydrate
Assignee: Evonik Operations GmbH
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Filing: 1972-02-17
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Granted: 1977-01-11
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Expires: 1992-02-17
Abstract
Abstract Abrasion resistant sodium perborate monohydrate is prepared by treating sodium perborate monohydrate with at least 5% of water at a temperature of 20° - 90° C. in a moistening unit and then drying at a temperature beginning at 40° C. and increasing to a maximum of 90° C.
Inventors
- 👤 Edmund Simmersbach
- 👤 Artur Schaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/055; C01B15/12; C01B15/126
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A process for the production of abrasion resistant sodium perborate monohydrate comprising treating preformed sodium perborate monohydrate in a moistening unit by adding water in an amount of 5 to 30 weight % of the sodium perborate monohydrate at a temperature of 20°-90° C. and then drying the monohydrate at a temperature beginning at 40° C. and increasing to a maximum of 90° C.
Claim 2
Dependent Claim
64 words
A process for the production of abrasion resistant sodium perborate monohydrate comprising treating preformed sodium perborate monohydrate in a moistening unit by adding water in an amount of 5 to 30 weight % of the sodium perborate monohydrate at a temperature of 20°-90° C. and then drying the monohydrate at a temperature beginning at 40° C. and increasing to a maximum of 90° C.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the water is used in an amount of 15 to 25 weight % of the monohydrate.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the water is sprayed on the monohydrate.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein the water is pure water.
Claim 6
Dependent Claim
33 words
A process according to claim 1 wherein the water contains a water soluble material in an amount which does not adversely affect the active oxygen content or the solubility time of the monohydrate.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein the water soluble material is an alcohol.
Claim 8
Dependent Claim
21 words
A process according to claim 5 wherein the water soluble material is sodium metaborate, sodium perborate, borax sodium silicate or phosphates.
Claim 9
Dependent Claim
14 words
A process according to claim 7 wherein the water soluble material is sodium metaborate.
Claim 10
Dependent Claim
15 words
A process according to claim 8 wherein the water contains 10% of the sodium metaborate.
Claim 11
Dependent Claim
14 words
A process according to claim 5 wherein the water soluble material is hydrogen peroxide.
Claim 12
Dependent Claim
13 words
A process according to claim 10 wherein the water contains 2% hydrogen peroxide.
Claim 13
Dependent Claim
32 words
A process according to claim 5 wherein the water soluble material is methanol, ethanol, isopropanol, propanol, diethyl ether, dimethyl ether, ethyl propyl ether, dipropyl ether, polyvinyl alcohol, acetone or methyl ethyl ketone.
Claim 14
Dependent Claim
54 words
A process according to claim 5 wherein the water soluble material is present in an amount of 2 to 10% of the aqueous solution and is methanol, ethanol, isopropanol, propanol, polyvinyl alcohol, diethyl ether, dimethyl ether, ethyl propyl ether, dipropyl ether, acetone, methyl ethyl ketone, sodium metaborate, sodium perborate, borax, sodium silicate or phosphate.
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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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |