US2727882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the continuous polymerization of bis-2-hydroxyethyl terephthalate
Assignee: EIDP Inc
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Filing: 1952-10-14
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Granted: 1955-12-20
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Expires: 1972-10-14
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Vodonik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:03
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B29; B29C; B29C63/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS FOR THE PRODUCTION OF LOW MOLECULAR WEIGHT POLYMERS FROM POLYMERIZABLE LIQUID COMPOSITIONS WHICH POLYMERIZE WITH THE EVOLUTION OF VAPOROUS BYPRODUCTS, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY PASSING THE POLYMERIZABLE LIQUID COMPOSITION SUCCESSIVELY THROUGH A SERIES OF PRESSURE-REDUCING REACTION ZONES, EACH MAINTAINED AT A TEMPERATURE EFFECTIVE TO PROMOTE POLYMERIZATION WITH THE EVOLUTION OF VAPOROUS BY-PRODUCTS, AND CAUSING THE POLYMERIZABLE LIQUID COMPOSITION TO BE-
Claim 2
Dependent Claim
64 words
IN A PROCESS FOR THE PRODUCTION OF LOW MOLECULAR WEIGHT POLYMERS FROM POLYMERIZABLE LIQUID COMPOSITIONS WHICH POLYMERIZE WITH THE EVOLUTION OF VAPOROUS BYPRODUCTS, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY PASSING THE POLYMERIZABLE LIQUID COMPOSITION SUCCESSIVELY THROUGH A SERIES OF PRESSURE-REDUCING REACTION ZONES, EACH MAINTAINED AT A TEMPERATURE EFFECTIVE TO PROMOTE POLYMERIZATION WITH THE EVOLUTION OF VAPOROUS BY-PRODUCTS, AND CAUSING THE POLYMERIZABLE LIQUID COMPOSITION TO BE-
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) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |