US2625536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutral esters of dicarboxylic acid orthophosphoric acid mixed anhydrides and condensation polymerization process utilizing the same
Assignee: EIDP Inc
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Filing: 1951-05-05
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Granted: 1953-01-13
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Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Kirby James Emory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/095; C07F9/096
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A PROCESS FOR THE PREPARATION OF LINEAR POLYAMIDES WHICH COMPRISES REACTING A DIAMINE WHOSE ONLY ZEREWITINOFF ACTIVE HYDROGEN IS HYDROGEN ON EACH AMINO NITROGEN AT A TEMPERATURE OF -10 TO +70* C. WITH A NEUTRAL MONOHYDRIC ALCOHOL ESTER OF A MIXED ANHYDRIDE WHEREIN EACH CARBOXYL OF A DICARBOXYLIC ACID OF AT LEAST SIX CHAIN CARBONS IS ANHYDRIDIZED WITH A MOLECULE OF ORTHOPHOSPHORIC ACID IN WHICH ESTER BOTH HYDROXYLS OF EACH PHOSPHORIC ACID MOIETY OF THE MIXED ANHYDRIDE ARE ESTERIFIED.
References Cited (Backward Citations)
US2130523A
Cited
US2574554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |