US2981715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polyamides with alkaryl phosphinates
Assignee: EIDP Inc
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Filing: 1958-10-02
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Granted: 1961-04-25
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Expires: 1978-10-02
Abstract
No abstract record available.
Inventors
- 👤 Victor R Ben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS OF PREPARING A YELLOWING INHIBITED POLYAMIDE WHEREIN THE AMIDE LINKAGE IS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN WHICH COMPRISES PREPARING THE POLYMER BY MELT POLYMERIZATION IN THE PRESENCE OF A DISSOLVED PHOSPHINATE COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
40 words
A PROCESS OF PREPARING A YELLOWING INHIBITED POLYAMIDE WHEREIN THE AMIDE LINKAGE IS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN WHICH COMPRISES PREPARING THE POLYMER BY MELT POLYMERIZATION IN THE PRESENCE OF A DISSOLVED PHOSPHINATE COMPOUND OF THE FORMULA
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |