US2885436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of lactic acid
Assignee: Danske Sukkerfabrikker AS
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Filing: 1957-02-26
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Granted: 1959-05-05
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Expires: 1977-02-26
Abstract
No abstract record available.
Inventors
- 👤 Wangel Jorgen Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/445
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE PURIFICATION OF LACTIC ACID COMPRISING SUBJECTING THE LACTIC ACID TO A STEAM DISTILLATION, SAID DISTILLATION BEING CARRIED OUT IN THE PRESENCE OF A HYDROLYZING CATALYST CONSISTING OF PLOSPHORIC ACID AT A PRESSURE OF ABOUT ATMOSPHERIC, THE TEMPERATURE OF THE ACID DISTILLATION MIXTURE BEING 140 TO 200* C. AND THE TEMPERATURE OF THE STEAM BEING 170 TO 250* C.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE PURIFICATION OF LACTIC ACID COMPRISING SUBJECTING THE LACTIC ACID TO A STEAM DISTILLATION, SAID DISTILLATION BEING CARRIED OUT IN THE PRESENCE OF A HYDROLYZING CATALYST CONSISTING OF PLOSPHORIC ACID AT A PRESSURE OF ABOUT ATMOSPHERIC, THE TEMPERATURE OF THE ACID DISTILLATION MIXTURE BEING 140 TO 200* C. AND THE TEMPERATURE OF THE STEAM BEING 170 TO 250* C.
References Cited (Backward Citations)
US2278831A
Cited
US2438208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |