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Patent US3832447A successfully refreshed from Google Patents.
US3832447A
Expired / Lapsed
US
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Method for producing sodium perborate trihydrate
Assignee: Kali Chemie AG
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Filing: 1971-10-12
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Granted: 1974-08-27
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Expires: 1991-10-12
Abstract
Abstract A method for producing sodium perborate trihydrate, including mixing, at a temperature above 10*C, hydrogen peroxide with a sodium metaborate solution in the presence of seed crystals of sodium perborate trihydrate and means for reducing the solubility of sodium perborate, and maintaining a NaBO2 to H2O2 ratio in the resulting mixture in the range 1:0.4 to 1:0.7.
Inventors
- 👤 R Siegel
- 👤 H Dillenburg
- 👤 H Honig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:30
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/055; C01B15/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A method as claimed in claim 1, further comprising removing a portion of the resulting mixutre for collecting sodium perborate trihydrate product, the mixing, maintaining, and removing being performed continuously.
Claim 2
Dependent Claim
17 words
A method as claimed in claim 1, further comprising keeping the resulting mixture at 30* to 50*C.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, wherein the NaBO2 to H2O2 ratio is maintained in the range 1:0.5 to 1:0.6.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 4 wherein the alkali-salt is sodium chloride.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |