Patent US2868849A successfully refreshed from Google Patents.
US2868849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of methanol
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-10-24
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Granted: 1959-01-13
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Expires: 1976-10-24
Abstract
No abstract record available.
Inventors
- 👤 Harry S Leach
- 👤 Billy M Eldred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:10
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PROCESS FOR THE PURIFICATION OF CRUDE SYNTHETIC METHANOL WHICH CONSISTS OF TREATING SAID METHANOL WITH SULFURIC ACID AND POTASSIUM PERMANGANATE, NEUTRALIZING THE ACID PRESENT WITH SODIUM HYDROXIDE, FILTERING TO REMOVE ANY SOLIDS AND DISTILLING THE METHANOL FILTRATE OBTAINED TO PRODUCE A PURIFIED METHANOL DISTILLATE, THE IMPROVEMENT WHICH COMPRISES ADDING A MINOR AMOUNT OF AN ALKALI METAL HYDROXIDE TO SAID METHANOL DISTILLATE WHEREBY THE PERMANGANATE TIME OF SAID PURIFIED METHANOL IS SIGNIFICANTLY LENGTHENED, SAID MINOR AMOUNT BEING IN THE RANGE FROM ABOUT 5 TO ABOUT 40 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF SAID METHANOL DISTILLATE.
Claim 2
Dependent Claim
99 words
IN A PROCESS FOR THE PURIFICATION OF CRUDE SYNTHETIC METHANOL WHICH CONSISTS OF TREATING SAID METHANOL WITH SULFURIC ACID AND POTASSIUM PERMANGANATE, NEUTRALIZING THE ACID PRESENT WITH SODIUM HYDROXIDE, FILTERING TO REMOVE ANY SOLIDS AND DISTILLING THE METHANOL FILTRATE OBTAINED TO PRODUCE A PURIFIED METHANOL DISTILLATE, THE IMPROVEMENT WHICH COMPRISES ADDING A MINOR AMOUNT OF AN ALKALI METAL HYDROXIDE TO SAID METHANOL DISTILLATE WHEREBY THE PERMANGANATE TIME OF SAID PURIFIED METHANOL IS SIGNIFICANTLY LENGTHENED, SAID MINOR AMOUNT BEING IN THE RANGE FROM ABOUT 5 TO ABOUT 40 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF SAID METHANOL DISTILLATE.
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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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |