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US3718616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impact p olyvinyl-aromatic compositions
Assignee: Shell USA Inc
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Filing: 1971-04-14
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Granted: 1973-02-27
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Expires: 1991-04-14
Abstract
Abstract The impact strength of polyvinyl-aromatic compositions such as impact polystyrene is appreciably increased by the addition of at least 13 percent weight of petroleum jelly.
Inventors
- 👤 L Muirhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:37
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
A composition as in claim 1 wherein the monovinyl-aromatic compound is styrene.
Claim 2
Dependent Claim
13 words
A composition as in claim 1 wherein said elastomer is a styrene-butadiene rubber.
Claim 3
Dependent Claim
18 words
A composition as in claim 1 wherein the amount of lubricant is at least 14 percent by weight.
Claim 4
Dependent Claim
12 words
A composition as in claim 1 wherein the lubricant is petroleum jelly.
Claim 5
Dependent Claim
11 words
A composition as in claim 1 wherein said elastomer is polybutadiene.
References Cited (Backward Citations)
US3428712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |