US2908715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing formalin by oxidation of methanol
Assignee: Individual
•
Filing: 1956-07-05
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Granted: 1959-10-13
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Expires: 1976-07-05
Abstract
No abstract record available.
Inventors
- 👤 Eguchi Takashi
- 👤 Yamamoto Tamechika
- 👤 Yamauchi Saburo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:12
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A PROCESS FOR THE PREPARATION OF FORMALIN BY OXIDATION OF METHANOL IN AN OXIDATION ZONE COMPRISING A CATALYST BED, THE STEPS WHICH COMPRISES PASSING METHANOL AND AN OXIDIZING GAS DOWNWARDLY THROUGH SAID ZONE AND SIMULTANEOUSLY DIRECTING A SPRAY OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF WATER, FORMALIN, AND METHANOL UPWARDLY INTO SAID ZONE ONTO THE LOWER SURFACE OF SAID CATALYST BED, WHERBY SAID SPRAY MOVES COUNTERCURRENTLY TO SAID METHANOL AND SAID OXIDIZING GAS AND THERE IS EFFECTED SIMULTANEOUS DIRECT HEAT EXCHANGE BETWEEN SAID SPRAY AND SAID CATALYST BED AND BETWEEN SAID SPRAY AND THE PRODUCT GASES RESULTING FROM REACTION BETWEEN SAID METHANOL AND OXIDIZING GAS.
Claim 2
Dependent Claim
109 words
IN A PROCESS FOR THE PREPARATION OF FORMALIN BY OXIDATION OF METHANOL IN AN OXIDATION ZONE COMPRISING A CATALYST BED, THE STEPS WHICH COMPRISES PASSING METHANOL AND AN OXIDIZING GAS DOWNWARDLY THROUGH SAID ZONE AND SIMULTANEOUSLY DIRECTING A SPRAY OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF WATER, FORMALIN, AND METHANOL UPWARDLY INTO SAID ZONE ONTO THE LOWER SURFACE OF SAID CATALYST BED, WHERBY SAID SPRAY MOVES COUNTERCURRENTLY TO SAID METHANOL AND SAID OXIDIZING GAS AND THERE IS EFFECTED SIMULTANEOUS DIRECT HEAT EXCHANGE BETWEEN SAID SPRAY AND SAID CATALYST BED AND BETWEEN SAID SPRAY AND THE PRODUCT GASES RESULTING FROM REACTION BETWEEN SAID METHANOL AND OXIDIZING GAS.
References Cited (Backward Citations)
US2064317A
Cited
US2412014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |