US2656340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic-alkene copolymers of less than 5 per cent aromatic content
Assignee: Standard Oil Development Co
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Filing: 1950-07-27
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Granted: 1953-10-20
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Expires: 1970-07-27
Abstract
No abstract record available.
Inventors
- 👤 William J Sparks
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
A PRODUCT CONSISTING OF ESSENTIALLY A RUBBERY SUBSTANTIALLY SATURATED TWO-COMPONENT COPOLYMER OF MORE THAN 95% OF ISOBUTYLENE AND AT LEAST ABOUT 0.5% BUT LESS THAN 5% OF STYRENE, SAID COPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 30,000 AND BEING SOLUBLE IN HIGHLY PARAFFINIC LUBRICATING OILS AT TEMPERATURES AS LOW AS 10* C. AND BEING SOLUBLE IN BENZENE AT 20* C.
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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |