US3285877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of monomeric formaldehyde
Assignee: Bayer AG
•
Filing: 1963-03-06
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Granted: 1966-11-15
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Expires: 1983-03-06
Abstract
No abstract record available.
Inventors
- 👤 Kocher Ernst-Ulrich
- 👤 Wagner Kuno
- 👤 Haupt Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:43
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT PROYOXYMETHYLENE BY POLYMERIZING MONOMERIC FORMALDEHYDE WHICH COMPRISES MAINTAINING INITIALLY SUPPLIED POLYOXYMETHYLENE HAVING AN INTRINSIC VISCOSITY FROM ABOUT 0.2 TO 1.2 AND HAVING A CATALYTIC AMOUNT OF A DIVALENT TIN COMPOUND AS CATALYST FOR SAID POLYMERIZATION SUPPORTED THEREON, AS A FLUIDIZED BED WITHIN A REACTION ZONE AT A TEMPERATURE OF FROM AOUT 30 TO 110* C. WHILE INTRODUCTION GASEOUS MONOMERIC FORMALDEHYDE CONTAINING FROM 0.3 TO 5% BY WEIGHT OF WATER INTO SAID REACTION ZONE AND SUBSEQUENTLY RECOVERING THE RESULTING HIGH MOLECULAR WEIGHPOLYOXYMETHYLENE.
Claim 2
Dependent Claim
88 words
THE PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT PROYOXYMETHYLENE BY POLYMERIZING MONOMERIC FORMALDEHYDE WHICH COMPRISES MAINTAINING INITIALLY SUPPLIED POLYOXYMETHYLENE HAVING AN INTRINSIC VISCOSITY FROM ABOUT 0.2 TO 1.2 AND HAVING A CATALYTIC AMOUNT OF A DIVALENT TIN COMPOUND AS CATALYST FOR SAID POLYMERIZATION SUPPORTED THEREON, AS A FLUIDIZED BED WITHIN A REACTION ZONE AT A TEMPERATURE OF FROM AOUT 30 TO 110* C. WHILE INTRODUCTION GASEOUS MONOMERIC FORMALDEHYDE CONTAINING FROM 0.3 TO 5% BY WEIGHT OF WATER INTO SAID REACTION ZONE AND SUBSEQUENTLY RECOVERING THE RESULTING HIGH MOLECULAR WEIGHPOLYOXYMETHYLENE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |