US3197437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trioxane polymerization process
Assignee: Celanese Corp
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Filing: 1960-08-17
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Granted: 1965-07-27
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Expires: 1980-08-17
Abstract
No abstract record available.
Inventors
- 👤 Wall James Estill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/10; C08G2/18; C08G2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
METHOD OF PRODUCING AN OXYMETHYLENE POLYMER WHICH COMPRISES TRIMERIZING AQUEOUS FORMALDEHYDE IN AN ACIDIC SYSTEM TO PRODUCE AND AQUEOUS PRODUCT COMPRISING TRIOXANE AND UNREACTED FORMALDEHYDE, EXTRACTING AT LEAST A PORTION OF SAID AQUEOUS PRODUCT WITH A STREAM OF BENZENE TO OBTAIN AN EXTRACTED TRIOXANE STREAM, PASSING TRIOXANE AND BENZENE FROM SAID EXTRACTED STREAM INTO A POLYMERIZATION ZONE TO PRODUCE A PRODUCT COMPRISING AN OXYMETHYLENE POLYMER, UNREACTED TRIOXANE AND BENZE, SEPARATING OXYMETHYLENE POLYMER FROM SAID PRODUCT TO PRODUCE A RESIDUE COMPRISING TRIOXANE AND BENZEN AND COMBINING SAID RESIDUE WITH AT LEAST ONE OF SAID AFOREMENTIONED STREAMS.
Claim 2
Dependent Claim
95 words
METHOD OF PRODUCING AN OXYMETHYLENE POLYMER WHICH COMPRISES TRIMERIZING AQUEOUS FORMALDEHYDE IN AN ACIDIC SYSTEM TO PRODUCE AND AQUEOUS PRODUCT COMPRISING TRIOXANE AND UNREACTED FORMALDEHYDE, EXTRACTING AT LEAST A PORTION OF SAID AQUEOUS PRODUCT WITH A STREAM OF BENZENE TO OBTAIN AN EXTRACTED TRIOXANE STREAM, PASSING TRIOXANE AND BENZENE FROM SAID EXTRACTED STREAM INTO A POLYMERIZATION ZONE TO PRODUCE A PRODUCT COMPRISING AN OXYMETHYLENE POLYMER, UNREACTED TRIOXANE AND BENZE, SEPARATING OXYMETHYLENE POLYMER FROM SAID PRODUCT TO PRODUCE A RESIDUE COMPRISING TRIOXANE AND BENZEN AND COMBINING SAID RESIDUE WITH AT LEAST ONE OF SAID AFOREMENTIONED STREAMS.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |