Patent US3628993A successfully refreshed from Google Patents.
US3628993A
Expired / Lapsed
US
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Thermally stabilized polyamide by coating particles with a cupric salt of a copolymer of ethylene with an unsaturated monocarboxylic acid and ester
Assignee: Gulf Research and Development Co
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Filing: 1969-06-06
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Granted: 1971-12-21
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Expires: 1989-06-06
Abstract
Abstract Discrete solid particles of polyamide are coated with a cupric salt of a carboxy-substituted olefin polymer in amounts of from about 0.1 percent to about 3.7 percent by weight to protect the polyamides from degradation during melt forming into manufactured articles.
Inventors
- 👤 Ronald E Gilbert
- 👤 Bert H Clampitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:58
CPC Classifications
C; C09; C09D; C09D177/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
The coated particles of claim 1 wherein the olefin is ethylene.
Claim 2
Dependent Claim
24 words
The coated particles of claim 2 wherein the cupric salt of the copolymer of ethylene with an unsaturated monocarboxylic acid contains amide carboxylate groups.
Claim 3
Dependent Claim
14 words
The coated Particles of claim 3 wherein the amide carboxylate is an amide acrylate.
Claim 4
Dependent Claim
27 words
The coated particles 4 wherein the amide acrylate is present in the copolymer at a ratio of 65 groups to 35 groups of the cupric salt acrylate.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |