Patent US2493597A successfully refreshed from Google Patents.
US2493597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of phosphite esters in the stabilization of linear polyamides
Assignee: Rohm and Haas Co
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Filing: 1946-03-05
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Granted: 1950-01-03
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Expires: 1966-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jr David A Rothrock
- 👤 Richard F Conyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:57
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR STABILIZING A LINEAR POLYAMIDE AGAINST CHANGES CAUSED BY EXPOSURE TO MOISTURE, HEAT, LIGHT, AND OXYGEN, WHICH COMPRISES REACTING AND CHEMICALLY COMBINING SAID POLYAMIDE, BY HEATING AT A TEMPERATURE OF 100*C. TO 300*C., WITH FROM 0.001 TO 0.07 MOLE, PER KILOGRAM OF SAID POLYAMIDE, OF A STABILIZING AGENT COMPRISING A MONOMERIC ESTER OF PHOSPHOROUS ACID, THE ORGANIC RADICALS OF WHICH ESTER ARE MONOVALENT HYDROCARBON RADICALS FREE OF NON-BENZENOID UNSATURATION, SAID LINEAR POLYAMIDE BEING THE PRODUCT OF CONDENSING, AT 200*C. TO 300*C., POLYMERIZABLE REACTANTS WHICH CONTAIN AMINO GROUPS AND CARBOXYL GROUPS AS THE SOLE REACTIVE GROUPS AND WHICH ARE MEMBERS OF THE CLASS CONSISTING OF (A) DIAMINES AND DICARBOXYLIC ACIDS, (B) AMINOCARBOXYLIC ACIDS, DICARBOXYLIC ACIDS AND SALTS OF DIAMINES.
Claim 2
Dependent Claim
120 words
A PROCESS FOR STABILIZING A LINEAR POLYAMIDE AGAINST CHANGES CAUSED BY EXPOSURE TO MOISTURE, HEAT, LIGHT, AND OXYGEN, WHICH COMPRISES REACTING AND CHEMICALLY COMBINING SAID POLYAMIDE, BY HEATING AT A TEMPERATURE OF 100*C. TO 300*C., WITH FROM 0.001 TO 0.07 MOLE, PER KILOGRAM OF SAID POLYAMIDE, OF A STABILIZING AGENT COMPRISING A MONOMERIC ESTER OF PHOSPHOROUS ACID, THE ORGANIC RADICALS OF WHICH ESTER ARE MONOVALENT HYDROCARBON RADICALS FREE OF NON-BENZENOID UNSATURATION, SAID LINEAR POLYAMIDE BEING THE PRODUCT OF CONDENSING, AT 200*C. TO 300*C., POLYMERIZABLE REACTANTS WHICH CONTAIN AMINO GROUPS AND CARBOXYL GROUPS AS THE SOLE REACTIVE GROUPS AND WHICH ARE MEMBERS OF THE CLASS CONSISTING OF (A) DIAMINES AND DICARBOXYLIC ACIDS, (B) AMINOCARBOXYLIC ACIDS, DICARBOXYLIC ACIDS AND SALTS OF DIAMINES.
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) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |