US2833623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of boric acid from trimethyl borate
Assignee: Callery Chemical Co
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Filing: 1954-11-26
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Granted: 1958-05-06
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Frank H May
- 👤 Vladimir V Levasheff
- 👤 Howard N Hammar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:47
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; C01B35/08; C01B35/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A METHOD OF PREPARING BORIC ACID FROM A MIXTURE OF TRIMETHYL BORATE AND METHANOL COMPRISING HYDROLYZING TRIMETHYL BORATE CONTAINED IN SUCH A MIXTURE WITH A SUBSTANTIAL STOICHIOMETRIC EXCESS OF A SATURATED AQUEOUS SOLUTION OF BORIC ACID, RECOVERING THE BORIC ACID THAT PRECIPITATES DURING HYDROLYSIS, DISTILLING OFF METHANOL FROM THE HYDROLYSIS MIXTURE THAT HAS BEEN FREED OF PRECIPITATED BORIC ACID, CRYSTALLIZING BORIC ACID FROM THE RESIDUE OF SAID DISTILLATION, AND RECOVERING THE SRYSTALLIZED BORIC ACID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |