US2951059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase polymerization of trioxane
Assignee: Celanese Corp
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Filing: 1958-03-24
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Granted: 1960-08-30
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Expires: 1978-03-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Oliver H Axtell
- 👤 Charles M Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:44
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH COMPRISES CONTINUOUSLY INTRODUCING VAPOR PHASE TRIOXANE INTO A CONFINED REACTION ZONE HAVING A SURFACE COOLED BY PASSAGE OF A COOLING MEDIUM, CONTINUOUSLY INTRODUCING INTO SAID REACTION ZONE IN VAPOR PHASE A CATALYST FOR THE POLYMERIZATION OF TRIOXANE TO POLYOXYMETHYLENE TO PROMOTE THE FORMATION OF SOLID POLYOXYMETHYLENE PARTICLES THEREIN, AND WITHDRAWING SAID SOLID POLYOXYMETHYLENE PARTICLES FROM SAID REACTION ZONE.
Claim 2
Dependent Claim
68 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH COMPRISES CONTINUOUSLY INTRODUCING VAPOR PHASE TRIOXANE INTO A CONFINED REACTION ZONE HAVING A SURFACE COOLED BY PASSAGE OF A COOLING MEDIUM, CONTINUOUSLY INTRODUCING INTO SAID REACTION ZONE IN VAPOR PHASE A CATALYST FOR THE POLYMERIZATION OF TRIOXANE TO POLYOXYMETHYLENE TO PROMOTE THE FORMATION OF SOLID POLYOXYMETHYLENE PARTICLES THEREIN, AND WITHDRAWING SAID SOLID POLYOXYMETHYLENE PARTICLES FROM SAID REACTION ZONE.
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) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |