Patent US2527655A successfully refreshed from Google Patents.
US2527655A
Expired / Lapsed
US
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Concentration of formaldehyde
Assignee: EIDP Inc
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Filing: 1948-06-03
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Granted: 1950-10-31
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Expires: 1968-06-03
Abstract
No abstract record available.
Inventors
- 👤 Pyle Cyrus
- 👤 James A Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:01
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/322; C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE PROCESS OF CONCENTRATING FORMALDEHYDE WHICH COMPRISES FRACTIONATING AN AQUEOUS SOLUTION OF FORMALDEHYDE IN A FRACTIONATING SYSTEM HAVING TWO CONNECTED FRACTIONATING ZONES WHILE MAINTAINING A PRESSURE DIFFERENTIAL OF AT LEAST 100 MM. HG BETWEEN SAID TWO ZONES, SAID ZONES SO CONNECTED THAT THE VAPOR FROM THE HIGH PRESSURE ZONE PASSED INTO THE LOWER PRESSURE ZONE NEAR THE BOTTOM THEREOF AND THE LIQUID EFFLUENT FROM THE LOWER PRESSURE ZONE PASSES INTO THE HIGHER PRESSURE ZONE NEAR THE TOP THEREOF, THE FORMALDEHYDE CONCENTRATION IN THE AQUEOUS SOLUTION FED TO THE SYSTEM BEING HIGHER THAN THE CONCENTRATION OF FORMALDEHYDE IN THE VAPORS PASSING FROM SAID SYSTEM.
Claim 2
Dependent Claim
103 words
THE PROCESS OF CONCENTRATING FORMALDEHYDE WHICH COMPRISES FRACTIONATING AN AQUEOUS SOLUTION OF FORMALDEHYDE IN A FRACTIONATING SYSTEM HAVING TWO CONNECTED FRACTIONATING ZONES WHILE MAINTAINING A PRESSURE DIFFERENTIAL OF AT LEAST 100 MM. HG BETWEEN SAID TWO ZONES, SAID ZONES SO CONNECTED THAT THE VAPOR FROM THE HIGH PRESSURE ZONE PASSED INTO THE LOWER PRESSURE ZONE NEAR THE BOTTOM THEREOF AND THE LIQUID EFFLUENT FROM THE LOWER PRESSURE ZONE PASSES INTO THE HIGHER PRESSURE ZONE NEAR THE TOP THEREOF, THE FORMALDEHYDE CONCENTRATION IN THE AQUEOUS SOLUTION FED TO THE SYSTEM BEING HIGHER THAN THE CONCENTRATION OF FORMALDEHYDE IN THE VAPORS PASSING FROM SAID SYSTEM.
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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |