US2756265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylated polystyrene pour depressants
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-10-21
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Granted: 1956-07-24
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Expires: 1973-10-21
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Hollyday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:41
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F8/00; C08F8/02; C10M2205/00; C10M2205/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR THE FORMATION OF ALKYLATED POLYSTYRENE POUR POINT DEPRESSORS WHICH COMPRISES THE STEPS OF DISSOLVING A POLYSTYRENE HAVING AN INTRINSIC VISCOSITY WITHIN A RANGE OF FROM 0.2 TO 1.0 IN A SOLVENT, ADDING TO THE SOLUTION FROM 10.0% TO 25.0% BY WEIGHT, BASED ON THE WEIGHT OF THE POLYSTYRENE, OF A FRIEDEL-CRAFTS CATALYST AND SUFFICIENT NITROBENZENE SO THAT THE MOL RATIO OF SAID NITROBENZENE TO SAID CATALYST IS WITHIN A RANGE OF FROM 0.2 TO 0.8, ADDING TO SAID MIXTURE AN ALIPHATIC OLEFINIC HYDROCARBON HAVING FROM 16 TO 20 CARBON ATOMS PER MOLECULE, MAINTAINING THE TEMPERATURE OF THE REACTION BETWEEN 80* F. AND 150* F. FOR THE DESIRED PERIOD OF TIME, THE TEMPERATURE, THE PERCENTAGE OF CATALYST, AND THE MOL RATIO OF NITROBENZENE TO CATALYST BEING SO CONTROLLED THAT THE RELATIONSHIP
Claim 2
Dependent Claim
133 words
A PROCESS FOR THE FORMATION OF ALKYLATED POLYSTYRENE POUR POINT DEPRESSORS WHICH COMPRISES THE STEPS OF DISSOLVING A POLYSTYRENE HAVING AN INTRINSIC VISCOSITY WITHIN A RANGE OF FROM 0.2 TO 1.0 IN A SOLVENT, ADDING TO THE SOLUTION FROM 10.0% TO 25.0% BY WEIGHT, BASED ON THE WEIGHT OF THE POLYSTYRENE, OF A FRIEDEL-CRAFTS CATALYST AND SUFFICIENT NITROBENZENE SO THAT THE MOL RATIO OF SAID NITROBENZENE TO SAID CATALYST IS WITHIN A RANGE OF FROM 0.2 TO 0.8, ADDING TO SAID MIXTURE AN ALIPHATIC OLEFINIC HYDROCARBON HAVING FROM 16 TO 20 CARBON ATOMS PER MOLECULE, MAINTAINING THE TEMPERATURE OF THE REACTION BETWEEN 80* F. AND 150* F. FOR THE DESIRED PERIOD OF TIME, THE TEMPERATURE, THE PERCENTAGE OF CATALYST, AND THE MOL RATIO OF NITROBENZENE TO CATALYST BEING SO CONTROLLED THAT THE RELATIONSHIP
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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |