Patent US3272776A successfully refreshed from Google Patents.
US3272776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of poly
Assignee: Eastman Kodak Co
•
Filing: 1962-04-05
•
Granted: 1966-09-13
•
Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:45
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE PROCESS OF PRODUCING A LINEAR HIGH MOLECULAR WEIGHT FILM AND FIBER FORMING POLY(ESTER-AMIDE) WHICH COMPRISES REACTING IN AN AQUEOUS SOLUTION A DIAMMONIUM SALT OF A DICARBOXYLIC ACID WITH AN AMINOALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF 100-200*C., SAID DIAMMONIUM SALT AND SAID AMINOALCOHOL BEING PRESENT IN SUBSTANTIALLY EQUAL MOLECULAR PROPORTIONS, CONTINUING THE REACTION WITHIN THIS TEMPERATURE RANGE UNTIL THE WATER FROM THE SOLUTION AND THE WATER FORMED IN THE REACTION ARE REMOVED, THEREAFTER CONTINUING THE REACTION AT A TEMPERATURE WITHIN THE RANGE OF 200-300*C. AND CONTINUING THE REACTION AT REDUCED PRESSURE BELOW ABOUT 5 MM. OF HG PRESSURE WHEREBY THE POLY(EXTER-AMIDE) IS FORMED.
Claim 2
Dependent Claim
105 words
THE PROCESS OF PRODUCING A LINEAR HIGH MOLECULAR WEIGHT FILM AND FIBER FORMING POLY(ESTER-AMIDE) WHICH COMPRISES REACTING IN AN AQUEOUS SOLUTION A DIAMMONIUM SALT OF A DICARBOXYLIC ACID WITH AN AMINOALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF 100-200*C., SAID DIAMMONIUM SALT AND SAID AMINOALCOHOL BEING PRESENT IN SUBSTANTIALLY EQUAL MOLECULAR PROPORTIONS, CONTINUING THE REACTION WITHIN THIS TEMPERATURE RANGE UNTIL THE WATER FROM THE SOLUTION AND THE WATER FORMED IN THE REACTION ARE REMOVED, THEREAFTER CONTINUING THE REACTION AT A TEMPERATURE WITHIN THE RANGE OF 200-300*C. AND CONTINUING THE REACTION AT REDUCED PRESSURE BELOW ABOUT 5 MM. OF HG PRESSURE WHEREBY THE POLY(EXTER-AMIDE) IS FORMED.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |