Patent US2585427A successfully refreshed from Google Patents.
US2585427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process fob preparing condensation
Assignee: —
•
Filing: 1951-01-11
•
Granted: 1952-02-12
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Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR POLYMERIZING HYDROXYACETIC ACID WHICH COMPRISES HEATING AND DISTILLING WATER FROM HYDROXYACETIC ACID AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AT TEMPERATURES OF 160* C. TO 23* C. UNTIL RAPID EVOLUTION OF WATER CEASES, HEATING AND DISTILLING WATER AND GLYCOLIDE FROM THE RESULTING MATERIAL UNDER VACUUM AND AT TEMPERATURE ABOVE THE MELTING POINT OF THE MATERIAL BUT BELOW 230* C. UNTIL EVOLUTION OF WATER SUBSTANTIALLY CEASES, ADDING A CATALYTIC AMOUNT OF ANTIMONY TRIFLUORIDE AND NOT LESS THAN 0.05 PERCENT BY WEIGHT OF TRIPHENYL PHOSPHITE, AND FINALLY HEATING MATERIAL UNDER VACUUM IN THE PRESENCE OF ANTIMONY TRIFLUORIDE AND TRIPHENYL PHOSPHITE AT TEMPERATURES ABOVE THE MELTING POINT OF THE MATERIAL BUT BELOW THE TEMPERATURE AT WHICH OBJECTIONABLE DISCOLORATION OCCURS UNTIL A POLYMER OF THE DESIRED HIGH MOLECULAR WEIGHT IS OBTAINED.
Claim 2
Dependent Claim
128 words
A PROCESS FOR POLYMERIZING HYDROXYACETIC ACID WHICH COMPRISES HEATING AND DISTILLING WATER FROM HYDROXYACETIC ACID AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AT TEMPERATURES OF 160* C. TO 23* C. UNTIL RAPID EVOLUTION OF WATER CEASES, HEATING AND DISTILLING WATER AND GLYCOLIDE FROM THE RESULTING MATERIAL UNDER VACUUM AND AT TEMPERATURE ABOVE THE MELTING POINT OF THE MATERIAL BUT BELOW 230* C. UNTIL EVOLUTION OF WATER SUBSTANTIALLY CEASES, ADDING A CATALYTIC AMOUNT OF ANTIMONY TRIFLUORIDE AND NOT LESS THAN 0.05 PERCENT BY WEIGHT OF TRIPHENYL PHOSPHITE, AND FINALLY HEATING MATERIAL UNDER VACUUM IN THE PRESENCE OF ANTIMONY TRIFLUORIDE AND TRIPHENYL PHOSPHITE AT TEMPERATURES ABOVE THE MELTING POINT OF THE MATERIAL BUT BELOW THE TEMPERATURE AT WHICH OBJECTIONABLE DISCOLORATION OCCURS UNTIL A POLYMER OF THE DESIRED HIGH MOLECULAR WEIGHT IS OBTAINED.
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |