Patent US2216999A successfully refreshed from Google Patents.
US2831834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyamides
Assignee: EIDP Inc
•
Filing: 1951-05-12
•
Granted: 1958-04-22
•
Expires: 1971-05-12
Abstract
No abstract record available.
Inventors
- 👤 Magat Eugene Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:35
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PREPARING A POLYAMIDE COMPRISES BRINGING TOGETHER, AS ESSENTIALLY THE SOLE POLYMERFORMING REACTANTS, ORGANIC DIAMINE IN ONE LIQUID PHASE AND ORGANIC DICARBOXYLIC ACID HALIDE IN A SECOND LIQUID PHASE IMMISCIBLE WITH THE FIRST PHASE, MIXING THE LIQUID PHASES TO FORM A SYSTEM COMPRISED OF TWO LIQUID PHASES SUCH THAT DIAMINE AND ACID HALIDE ARE IN SEPARATE PHASES AND AT LEAST ONE OF THE PHASE INCLUDES A LIQUID DILUENT, AND MAINTAINING THE PHASES IN ADMIXTURE, IN THE PRESENCE OF AN ACID ACCEPTOR, UNTIL AN INTERPHASE CONDENSATION POLYMERIZATION HAS TAKEN PLACE WITH FORMATION OF A SPINNABLE POLYAMIDE.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PREPARING A POLYAMIDE COMPRISES BRINGING TOGETHER, AS ESSENTIALLY THE SOLE POLYMERFORMING REACTANTS, ORGANIC DIAMINE IN ONE LIQUID PHASE AND ORGANIC DICARBOXYLIC ACID HALIDE IN A SECOND LIQUID PHASE IMMISCIBLE WITH THE FIRST PHASE, MIXING THE LIQUID PHASES TO FORM A SYSTEM COMPRISED OF TWO LIQUID PHASES SUCH THAT DIAMINE AND ACID HALIDE ARE IN SEPARATE PHASES AND AT LEAST ONE OF THE PHASE INCLUDES A LIQUID DILUENT, AND MAINTAINING THE PHASES IN ADMIXTURE, IN THE PRESENCE OF AN ACID ACCEPTOR, UNTIL AN INTERPHASE CONDENSATION POLYMERIZATION HAS TAKEN PLACE WITH FORMATION OF A SPINNABLE POLYAMIDE.
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |