Patent US6387380B1 successfully refreshed from Google Patents.
US3268499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer crystallization method
Assignee: Shell USA Inc
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Filing: 1965-09-10
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Granted: 1966-08-23
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Expires: 1985-09-10
Abstract
No abstract record available.
Inventors
- 👤 Wales Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF PRODUCING LOW ASH POLYPROPYLENE ARTICLES OF IMPROVED CLARITY, HARDNESS, IZOD IMPACT STRENGTH, AND TENSILE STRENGTH WHICH COMPRISES (A) DISPERSING IN (1) POLYPROPYLENE HAVING A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST 40,000 AND A CRYSTALLINITY OF AT LEAST 50 PERCENT, AS MEASURED BY X-RAY ANALYSIS (2) LITHIUM SALT OF BENZOIC ACID IN AN AMOUNT IN THE RANGE 0.001 TO 1 PERCENT BY WEIGHT, BASED ON THE POLYMER, (B) MELTING THE RESULTING MIXTURE, (C) SHAPING THE MELT INTO A DESIRE SHAPE, AND (D) SOLIDIFYING THE MELT BY COOLING IT.
Claim 2
Independent Claim
91 words
THE METHOD OF PRODUCING LOW ASH POLYPROPYLENE ARTICLES OF IMPROVED CLARITY, HARDNESS, IZOD IMPACT STRENGTH, AND TENSILE STRENGTH WHICH COMPRISES (A) DISPERSING IN (1) POLYPROPYLENE HAVING A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST 40,000 AND A CRYSTALLINITY OF AT LEAST 50 PERCENT, AS MEASURED BY X-RAY ANALYSIS (2) LITHIUM SALT OF BENZOIC ACID IN AN AMOUNT IN THE RANGE 0.001 TO 1 PERCENT BY WEIGHT, BASED ON THE POLYMER, (B) MELTING THE RESULTING MIXTURE, (C) SHAPING THE MELT INTO A DESIRE SHAPE, AND (D) SOLIDIFYING THE MELT BY COOLING IT.
References Cited (Backward Citations)
US3207739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |