US2504402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde synthesis
Assignee: EIDP Inc
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Filing: 1945-10-27
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Granted: 1950-04-18
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Expires: 1965-10-27
Abstract
No abstract record available.
Inventors
- 👤 Field Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:38
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453; C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; B01J2208/00061; B01J2208/00106; B01J2208/00168; B01J2208/00203; B01J2219/00; B01J2219/00002; B01J2219/00018; B01J2219/0002; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR THE VAPOR PHASE OXIDATION OF METHANOL TO FORMALDEHYDE THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE OXIDATION REACTION IN STAGES IN EACH ONE OF WHICH METHANOL IS CATALYTICALLY OXIDIZED TO FORMALDEHYDE AT A TEMPERATURE BETWEEN 225 AND 500*C., COOLING THE GASES BETWEEN STAGES TO REMOVE THE EXOTHERMIC HEAT PRODUCED IN THE PRECEDING STAGE AND ADDING METHANOL TO THE GASES BETWEN STAGES THE OXYGEN CONTENT OF THE GAS DECREASING IN EACH SUCCESSIVE STAGE.
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR THE VAPOR PHASE OXIDATION OF METHANOL TO FORMALDEHYDE THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE OXIDATION REACTION IN STAGES IN EACH ONE OF WHICH METHANOL IS CATALYTICALLY OXIDIZED TO FORMALDEHYDE AT A TEMPERATURE BETWEEN 225 AND 500*C., COOLING THE GASES BETWEEN STAGES TO REMOVE THE EXOTHERMIC HEAT PRODUCED IN THE PRECEDING STAGE AND ADDING METHANOL TO THE GASES BETWEN STAGES THE OXYGEN CONTENT OF THE GAS DECREASING IN EACH SUCCESSIVE STAGE.
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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |