US3046251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the acylation of polyoxymethylenes
Assignee: Bayer AG
•
Filing: 1960-03-09
•
Granted: 1962-07-24
•
Expires: 1980-03-09
Abstract
No abstract record available.
Inventors
- 👤 Wagner Kuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:45
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS OF ACYLATING A SOLID, FILM-FORMING HIGH MOLECULAR POLYOXYMETHYLENE WHICH COMPRISES CONTACTING 1 PART BY WEIGHT OF SAID HIGH MOLECULAR POLYOXYMETHYLENE AT TEMPERATURE OF ABOUT 50-200*C. WITH AT LEAST 2 PARTS BY WEIGHT OF A CARBOXYLIC ACID ANHYDRIENE AND ABOUT 0.5-20 PARTS BY WEIGHT OF AN ORGANIC ISOCYANATE HAVING AS THE SOLE REACTIVE GROUP AT LEAST ONE ISOCYANATE GROUP PER 100 PARTS BY WEIGHT OF SAID ANHYDRIDE.
Claim 2
Dependent Claim
68 words
A PROCESS OF ACYLATING A SOLID, FILM-FORMING HIGH MOLECULAR POLYOXYMETHYLENE WHICH COMPRISES CONTACTING 1 PART BY WEIGHT OF SAID HIGH MOLECULAR POLYOXYMETHYLENE AT TEMPERATURE OF ABOUT 50-200*C. WITH AT LEAST 2 PARTS BY WEIGHT OF A CARBOXYLIC ACID ANHYDRIENE AND ABOUT 0.5-20 PARTS BY WEIGHT OF AN ORGANIC ISOCYANATE HAVING AS THE SOLE REACTIVE GROUP AT LEAST ONE ISOCYANATE GROUP PER 100 PARTS BY WEIGHT OF SAID ANHYDRIDE.
References Cited (Backward Citations)
US2296249A
Cited
GB770717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |