US3002947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delustered and stabilized polyamide
Assignee: EIDP Inc
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Filing: 1959-05-22
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Granted: 1961-10-03
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Expires: 1979-05-22
Abstract
No abstract record available.
Inventors
- 👤 Maple Donald Elwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:57
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A PROCESS OF PREPARING POLYHEXAMETHYLENE ADIPAMIDE, THE IMPROVEMENT COMPRISING CONCENTRATING AN AQUEOUS SOLUTION OF HEXAMETHYLENE DIAMMONIUM ADIPATE, ADDING FROM 0.01-5% BY WEIGHT (DRY TIO2 BASED ON DRY ADIPATE) OF TIO2 IN A SLURRY WHEN THE CONCENTRATION OF THE ADIPATE SOLUTION IS AT LEAST ABOUT 70% BUT BEFORE ANY APPRECIABLE POLYMERIZATION HAS TAKEN PLACE, HEATING THE SOLUTION UNDER POLYMERIZATION CONDITIONS, AND ADDING TRACE AMOUNTS OF A MANGANOUS SALT HAVING A REDUCING ANION WHEN THE MOLECULAR WEIGHT OF THE POLYHEXAMETHYLENE ADIPAMIDE IS GREATER THAN ABOUT 1700 AND AFTER AT LEAST ABOUT 30 MINUTES FROM THE COMPLETION OF THE ADDITION OF TIO2.
Claim 2
Dependent Claim
100 words
IN A PROCESS OF PREPARING POLYHEXAMETHYLENE ADIPAMIDE, THE IMPROVEMENT COMPRISING CONCENTRATING AN AQUEOUS SOLUTION OF HEXAMETHYLENE DIAMMONIUM ADIPATE, ADDING FROM 0.01-5% BY WEIGHT (DRY TIO2 BASED ON DRY ADIPATE) OF TIO2 IN A SLURRY WHEN THE CONCENTRATION OF THE ADIPATE SOLUTION IS AT LEAST ABOUT 70% BUT BEFORE ANY APPRECIABLE POLYMERIZATION HAS TAKEN PLACE, HEATING THE SOLUTION UNDER POLYMERIZATION CONDITIONS, AND ADDING TRACE AMOUNTS OF A MANGANOUS SALT HAVING A REDUCING ANION WHEN THE MOLECULAR WEIGHT OF THE POLYHEXAMETHYLENE ADIPAMIDE IS GREATER THAN ABOUT 1700 AND AFTER AT LEAST ABOUT 30 MINUTES FROM THE COMPLETION OF THE ADDITION OF TIO2.
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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |