US2990394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1959-07-06
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Granted: 1961-06-27
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Expires: 1979-07-06
Abstract
No abstract record available.
Inventors
- 👤 Ainsworth William Forsyth
- 👤 Wright Ronald Barrie
- 👤 Press Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:23
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/04; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN OXIDATION-STABLIZED POLYMER COMPOSITIONS WHICH CONSIST ESSENTIALLY OF (1) A POLYMER COMPRISING POLYVINYL CHLORIDE, (2) AS PLASTICIZER, A DIALKYL ESTER OF AN ORGANIC DICARBOXYLIC ACID, AND (3) AN ANTIOXIDANT OF THE CLASS CONSISTING OF (A) THE CONDENSATION PRODUCT OF ACETONE AND DIPHENYLAMINE, (B) POLYMERIZED 2,2,4-TRI METHYL-O,4-DIHYDROQUINOLINE, AND (C) ALKYLATED DIPHENYLAMINES, THE IMPROVEMENT CONSISTING IN THE ADDITIONAL PRESENCE OF A MINOR AMOUNT OF DISALICYLIDENE-ETHYLENE DIAMINE.
Claim 2
Dependent Claim
64 words
IN OXIDATION-STABLIZED POLYMER COMPOSITIONS WHICH CONSIST ESSENTIALLY OF (1) A POLYMER COMPRISING POLYVINYL CHLORIDE, (2) AS PLASTICIZER, A DIALKYL ESTER OF AN ORGANIC DICARBOXYLIC ACID, AND (3) AN ANTIOXIDANT OF THE CLASS CONSISTING OF (A) THE CONDENSATION PRODUCT OF ACETONE AND DIPHENYLAMINE, (B) POLYMERIZED 2,2,4-TRI METHYL-O,4-DIHYDROQUINOLINE, AND (C) ALKYLATED DIPHENYLAMINES, THE IMPROVEMENT CONSISTING IN THE ADDITIONAL PRESENCE OF A MINOR AMOUNT OF DISALICYLIDENE-ETHYLENE DIAMINE.
References Cited (Backward Citations)
US2732366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |