US2535458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of formals
Assignee: —
•
Filing: —
•
Granted: 1950-12-26
•
Expires: 1967-12-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/30; C07C41/00; C07C41/48; C07C41/50; C07C41/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
PROCESS FOR THE PRODUCTION OF FORMALS BY THE REACTION OF AN ALCOHOL WITH FORMALDEHYDE IN THE PRESENCE OF AN ACID CATALYST, WHICH COMPRISES MIXING THE ALCOHOL AND ACID CATALYST WITH A WATER-IMMISCIBLE ENTRAINING AGENT FORMING A CONSTANT BOILING AZEOTROPE WITH WATER, HEATING THE MIXTURE TO ABOUT REFLUX TEMPERATURE, SLOWLY ADDING AQUEOUS FORMALDEHYDE TO THE MIXTURE WHILE INFLUXING THE LATER AND CONTINUOUSLY REMOVING THE WATER OF REACTION AS FORMED FROM THE REACTION MIXTURE WITH THE AID OF SAID ENTRAINING AGENT.
Claim 2
Dependent Claim
79 words
PROCESS FOR THE PRODUCTION OF FORMALS BY THE REACTION OF AN ALCOHOL WITH FORMALDEHYDE IN THE PRESENCE OF AN ACID CATALYST, WHICH COMPRISES MIXING THE ALCOHOL AND ACID CATALYST WITH A WATER-IMMISCIBLE ENTRAINING AGENT FORMING A CONSTANT BOILING AZEOTROPE WITH WATER, HEATING THE MIXTURE TO ABOUT REFLUX TEMPERATURE, SLOWLY ADDING AQUEOUS FORMALDEHYDE TO THE MIXTURE WHILE INFLUXING THE LATER AND CONTINUOUSLY REMOVING THE WATER OF REACTION AS FORMED FROM THE REACTION MIXTURE WITH THE AID OF SAID ENTRAINING AGENT.
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |