US3170896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for acylating polyoxymethylenes
Assignee: Bayer AG
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Filing: 1960-01-12
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Granted: 1965-02-23
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Expires: 1980-01-12
Abstract
No abstract record available.
Inventors
- 👤 Wagner Kuno
- 👤 Kritzler Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:03
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/30; C08G2/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A PROCESS OF ACYLATING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENES BY REACTING THEM AT ELEVATED TEMPERATURE WITH AN ANHYDRIDE OF A CARBOXYLIC ACID, THE IMPROVEMENT COMPRISING CONDUCTING THE REACTION IN THE PRESENCE OF ABOUT 0.5 TO 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID ANHYDRIDE OF A CARBODIIMIDE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC, CYCLOALIPHATIC, AROMATIC AND ARALIPHATIC CARBODIIMIDES, AND A BASIC ACYLATING CATALYST SELECTED FROM THE GROUP CONSISTING OF TERTIARY ORGANIC NITROGEN BASES, BASIC ALKALI METAL SALTS, AND BASIC ALKALINE EARTH METAL SALTS.
Claim 2
Dependent Claim
87 words
IN A PROCESS OF ACYLATING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENES BY REACTING THEM AT ELEVATED TEMPERATURE WITH AN ANHYDRIDE OF A CARBOXYLIC ACID, THE IMPROVEMENT COMPRISING CONDUCTING THE REACTION IN THE PRESENCE OF ABOUT 0.5 TO 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID ANHYDRIDE OF A CARBODIIMIDE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC, CYCLOALIPHATIC, AROMATIC AND ARALIPHATIC CARBODIIMIDES, AND A BASIC ACYLATING CATALYST SELECTED FROM THE GROUP CONSISTING OF TERTIARY ORGANIC NITROGEN BASES, BASIC ALKALI METAL SALTS, AND BASIC ALKALINE EARTH METAL SALTS.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |