Patent US2628218A successfully refreshed from Google Patents.
US2628218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyamides from a dinitrile and a ditertiary alcohol or ester of the last
Assignee: EIDP Inc
•
Filing: 1949-01-25
•
Granted: 1953-02-10
•
Expires: 1969-01-25
Abstract
No abstract record available.
Inventors
- 👤 Magat Eugene Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:23
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR PRODUCING SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES REACTING WITHIN THE TEMPERATURE RANGE OF -20* TO 80* C. AN ORGANIC DINITRILE OF THE FORMULA: NC-RM-CN, WHEREIN R IS A DIVALENT RADICAL FROM THE GROUP CONSISTING OF HYDROCARBON AND UNREACTIVE HETEROCYCLIC RADICALS AND M IS A NUMERAL FROM 0 TO 1, AND WATER WITH A SUBSTANTIALLY MOL EQUIVALENT OF THE DINITRILE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DITERTIARY ALCOHOLS AND CARBOXYLIC ACID ESTERS OF DITERITARY ALCOHOLS CONTAINING AS THE SOLE REACTING GROUPS ALCOHOL AND ESTER GROUPS, IN A STRONG ACID REACTION MEDIUM AND CONTINUING THE REACTION WITHIN SAID TEMPERATURE RANGE UNTIL A POLYMER OF THE DESIRED INTRINSIC VISCOSITY IF PRODUCED.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PRODUCING SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES REACTING WITHIN THE TEMPERATURE RANGE OF -20* TO 80* C. AN ORGANIC DINITRILE OF THE FORMULA: NC-RM-CN, WHEREIN R IS A DIVALENT RADICAL FROM THE GROUP CONSISTING OF HYDROCARBON AND UNREACTIVE HETEROCYCLIC RADICALS AND M IS A NUMERAL FROM 0 TO 1, AND WATER WITH A SUBSTANTIALLY MOL EQUIVALENT OF THE DINITRILE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DITERTIARY ALCOHOLS AND CARBOXYLIC ACID ESTERS OF DITERITARY ALCOHOLS CONTAINING AS THE SOLE REACTING GROUPS ALCOHOL AND ESTER GROUPS, IN A STRONG ACID REACTION MEDIUM AND CONTINUING THE REACTION WITHIN SAID TEMPERATURE RANGE UNTIL A POLYMER OF THE DESIRED INTRINSIC VISCOSITY IF PRODUCED.
References Cited (Backward Citations)
US2071250A
Cited
US2457660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |