US3207736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer crystallization
Assignee: Shell USA Inc
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Filing: 1961-12-20
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Granted: 1965-09-21
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Expires: 1981-12-20
Abstract
No abstract record available.
Inventors
- 👤 Pieter W O Wijga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:49
CPC Classifications
C; C11; C11D; C11D10/00; C11D10/04; C11D10/045; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/092; C11D1/00; C11D1/66; C11D1/755
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE METHOD OF CRYSTALLIZING A CRYSTALLIZABLE POLYOLEFIN WHICH COMPRISES (A) PRODUCING A MELT OF (A) A NORMALLY SOLID, CRYSTALLIZABLE POLYMER OF AN ALPHA-MONOOLEFIN OF TWO TO EIGHT CARBON ATOMS PER MOLECULE CONTAINING (B) AT LEAST TRACES OF THE RESIDUE OF A ZIEGLER POLYMERIZATION CATALYST, AND (C) AN EFFECTIVE AMOUNT, IN THE RANGE OF 0.01 TO 5 PERCENT WEIGHT, OF A CRYSTALLIZATION MODIFYING POLYCARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF (I) SATURATED AROMATIC POLYCARBOXYLIC ACID HAVING FROM 2 TO 4 CARABOXYL GROUPS PER MOLECULE, (II) SATURATED CYCLOALIPHATIC DICARBOXYLIC ACIDS, AND (III) SATURATED ALIPHATIC AND SATURATED HYDROCARBON-SUBSTITUTED ALLIPHATIC TERMINAL DICARBOXYLIC ACIDS HAVING 4 TO 12 CARBON ATOMS PER MOLECULE, (B) AND SOLIDIFYING SAID MELT BY COOLING IT.
Claim 2
Independent Claim
116 words
THE METHOD OF CRYSTALLIZING A CRYSTALLIZABLE POLYOLEFIN WHICH COMPRISES (A) PRODUCING A MELT OF (A) A NORMALLY SOLID, CRYSTALLIZABLE POLYMER OF AN ALPHA-MONOOLEFIN OF TWO TO EIGHT CARBON ATOMS PER MOLECULE CONTAINING (B) AT LEAST TRACES OF THE RESIDUE OF A ZIEGLER POLYMERIZATION CATALYST, AND (C) AN EFFECTIVE AMOUNT, IN THE RANGE OF 0.01 TO 5 PERCENT WEIGHT, OF A CRYSTALLIZATION MODIFYING POLYCARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF (I) SATURATED AROMATIC POLYCARBOXYLIC ACID HAVING FROM 2 TO 4 CARABOXYL GROUPS PER MOLECULE, (II) SATURATED CYCLOALIPHATIC DICARBOXYLIC ACIDS, AND (III) SATURATED ALIPHATIC AND SATURATED HYDROCARBON-SUBSTITUTED ALLIPHATIC TERMINAL DICARBOXYLIC ACIDS HAVING 4 TO 12 CARBON ATOMS PER MOLECULE, (B) AND SOLIDIFYING SAID MELT BY COOLING IT.
References Cited (Backward Citations)
US2838437A
Cited
US2978442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |