Patent US2565568A successfully refreshed from Google Patents.
US2565568A
Expired / Lapsed
US
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Formaldehyde purification
Assignee: Individual
•
Filing: 1948-11-05
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Granted: 1951-08-28
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Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
- 👤 James F Mccants
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:12
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/83
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
IN A PROCESS FOR RECOVERING FORMALDEHYDE IN A SUBSTANTIALLY ANHYDROUS CONDITION FROM AQUEOUS SOLUTIONS THEREOF, THE STEP WHICH COMPRISES CONTACTING A VAPOROUS MIXTURE OF FORMALDEHYDE AND WATER WITH LIQUID ACETONE CONDENSING AT LEAST A PORTION OF SAID WATER VAPOR WHILE MAINTAINING THE TEMPERATURE ABOVE ABOUT 80* C. AND SEPARATING THE CONDENSED WATER FROM THE REMAINING VAPORS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |