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US3560431A
Expired / Lapsed
US
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Prevention of yellowing in polyamides
Assignee: JOSEPH D DECAPRIO
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Filing: 1968-07-09
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Granted: 1971-02-02
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Expires: 1988-07-09
Abstract
Abstract THE BASE COLOR AND YELLOWING TENDENCY OF POLYAMIDE MATERIAL CONTAINING ALKALI METAL IODIDES IS SUBSTANTIALLY IMPROVED BY COMBINING THEREWITH A TRACE AMOUNT OF AN ALKALI METAL SALT ADDITIVE, SUCH AS SODIUM SULFITE, SODIUM THIOSULFATE OR A BISULFITE ADDITION COMPOUND OF ACETONE OR AN APPROPRIATE ALDEHYDE, THE ADDITIVE BEING INTRODUCED INTO THE POLYAMIDE MATERIAL OR THE SURFACE OF THE MATERIAL BEING CONTACTED WITH A SOLUTE CONTAINING THE ALKALI SALT ADDITIVE.
Inventors
- 👤 Gene C Weedon
- 👤 Joseph D Decaprio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:36
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |