Patent US3271369A successfully refreshed from Google Patents.
US3271369A
Expired / Lapsed
US
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Stabilization of polyoxymethylenes
Assignee: Evonik Operations GmbH
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Filing: 1964-09-09
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Granted: 1966-09-06
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Expires: 1984-09-09
Abstract
No abstract record available.
Inventors
- 👤 Kern Werner
- 👤 Jaacks Volker
- 👤 Deibig Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:04
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/30; C08G2/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A PROCESS FOR STABILIZING A POLYOXYMETHYLENE DIOL BY ETHERIFICATION OF ITS TERMINAL HYDROXY GROUPS WITH AN EPOXIDE COMPOUND HAVING A TERMINAL OXIRANE GROUP, THE STEP COMPRISING REACTING THE POLYOXYMETHYLENE DIOL WITH A COMBINATION OF SAID EPOXIDE COMPOUND AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALKYL HALIDE AN ARALKYL HALIDE AN ACID HALIDE OF AN ALIPHATIC CARBOXYLIC ACID AN ACID HALIDE OF AN AROMATIC CARBOXYLIC ACID AN ACID HALIDE OF A CYCLIC CARBOXYLIC ACID AN A-CHLORO ETHER REPRESENTED BY THE STRUCTURE
Claim 2
Dependent Claim
84 words
IN A PROCESS FOR STABILIZING A POLYOXYMETHYLENE DIOL BY ETHERIFICATION OF ITS TERMINAL HYDROXY GROUPS WITH AN EPOXIDE COMPOUND HAVING A TERMINAL OXIRANE GROUP, THE STEP COMPRISING REACTING THE POLYOXYMETHYLENE DIOL WITH A COMBINATION OF SAID EPOXIDE COMPOUND AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALKYL HALIDE AN ARALKYL HALIDE AN ACID HALIDE OF AN ALIPHATIC CARBOXYLIC ACID AN ACID HALIDE OF AN AROMATIC CARBOXYLIC ACID AN ACID HALIDE OF A CYCLIC CARBOXYLIC ACID AN A-CHLORO ETHER REPRESENTED BY THE STRUCTURE
References Cited (Backward Citations)
CA702123A
Cited
US3183211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |