US2683138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene-isoolefin-cyclic olefin tripolymer
Assignee: Standard Oil Development Co
•
Filing: 1949-08-20
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Granted: 1954-07-06
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Expires: 1969-08-20
Abstract
No abstract record available.
Inventors
- 👤 Hans G Goering
- 👤 Julius P Rocca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE PROCESS WHICH CONSISTS IN COPOLYMERIZING ABOUT 50-75% BY WEIGHT OF STYRENE, 25-35% OF ISOBUTYLENE AND 10-18% OF PROPYLENE, AT A TEMPERATURE OF -44* C. TO 0* C., IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON FLUORIDE AND ALUMINUM CHLORIDE.
Claim 2
Dependent Claim
45 words
THE PROCESS WHICH CONSISTS IN COPOLYMERIZING ABOUT 50-75% BY WEIGHT OF STYRENE, 25-35% OF ISOBUTYLENE AND 10-18% OF PROPYLENE, AT A TEMPERATURE OF -44* C. TO 0* C., IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON FLUORIDE AND ALUMINUM CHLORIDE.
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) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |