US2638445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated high molecular weight styrene-olefin copolymers
Assignee: Standard Oil Development Co
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Filing: 1945-05-05
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Granted: 1953-05-12
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Expires: 1965-05-05
Abstract
No abstract record available.
Inventors
- 👤 David W Young
- 👤 William H Smyers
- 👤 William J Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F8/30; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
PRODUCT CONSISTING ESSENTIALLY OF A SUBSTANTIALLY NEUTRAL BARIUM SULFONATE OF A STYRENE-ISOBUTYLENE COPOLYMER, HAVING A MOLECULAR WEIGHT OF ABOUT 4,000 TO 50,000 AND AN IODINE NUMBER LESS THAN 10, AND HAVING A COMBINED STYRENE CONTENT OF ABOUT 20%, SAID COPOLYMER SULFONATE HAVING SURFACE ACTIVE PROPERTIES AND VISCCOSITY INDEX IMPROVING PROPERTIES, AND BEING SUBSTANTIALLY SOLUBLE IN MINERAL LUBRICATING OIL, SAID COPOLYMER SULFONATE HAVING BEEN MADE BY REACTING 50 PARTS BY WT. OF THE HIGH MOLECULAR WEIGHT STYRENE-ISOBUTYLENE COPOLYMER WITH 15 PARTS BY WT. OF FUMING SULFURIC ACID AT 100* C. AND NEUTRALIZING WITH BARIUM HYDROXIDE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |