US2918508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisobutylene production
Assignee: Standard Oil Co
•
Filing: 1957-12-02
•
Granted: 1959-12-22
•
Expires: 1977-12-02
Abstract
No abstract record available.
Inventors
- 👤 John M Coppersmith
- 👤 Kenneth C Peterson
- 👤 Sutton Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:57
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/952
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE METHOD OF POLYMERIZING ISOBUTYLENE WHICH COMPRISES COOLING ISOBUTYLENE TO A POLYMERIZATION TEMPERATURE IN THE RANGE OF -20 TO 60*F. IN A COOLING ZONE AND INTRODUCING COOLED ISOBUTYLENE TOGETHER WITH AN AMOUNT OF BF3 FOR EFFECTING A CONVERSION OF ABOUT 1 TO 4 PERCENT PER PASS INTO A CONVERSION ZONE, RECYCLING THE MAJOR PART OF THE CONVERSION ZONE EFFLUENT WITH ITS DISSOLVED BF3 AND WITH ADDITIONAL CHARGE THROUGH SAID COOLING ZONE BACK TO SAID CONVERSION ZONE, WITHDRAWING A MINOR PART OF THE CONVERSION ZONE EFFLUENT AS A PRODUCT STREAM, CONVERTING RESIDUAL BF3 IN SAID STREAM TO FORM AN ADDUCT AND REMOVING SAID ADDUCT FROM THE REMAINING SOLUTION OF POLYMER IN UNCONVERTED ISOBUTYLENE, ADDING AN OIL OF LUBRICATING VISCOSITY TO SAID SOLUTION, STRIPPING LIGHT HYDROCARBONS FROM THE RESULTING MIXTURE AND RETURNING MOST OF THE STRIPPED HYDROCARBONS TO THE CONVERSION ZONE.
Claim 2
Independent Claim
139 words
THE METHOD OF POLYMERIZING ISOBUTYLENE WHICH COMPRISES COOLING ISOBUTYLENE TO A POLYMERIZATION TEMPERATURE IN THE RANGE OF -20 TO 60*F. IN A COOLING ZONE AND INTRODUCING COOLED ISOBUTYLENE TOGETHER WITH AN AMOUNT OF BF3 FOR EFFECTING A CONVERSION OF ABOUT 1 TO 4 PERCENT PER PASS INTO A CONVERSION ZONE, RECYCLING THE MAJOR PART OF THE CONVERSION ZONE EFFLUENT WITH ITS DISSOLVED BF3 AND WITH ADDITIONAL CHARGE THROUGH SAID COOLING ZONE BACK TO SAID CONVERSION ZONE, WITHDRAWING A MINOR PART OF THE CONVERSION ZONE EFFLUENT AS A PRODUCT STREAM, CONVERTING RESIDUAL BF3 IN SAID STREAM TO FORM AN ADDUCT AND REMOVING SAID ADDUCT FROM THE REMAINING SOLUTION OF POLYMER IN UNCONVERTED ISOBUTYLENE, ADDING AN OIL OF LUBRICATING VISCOSITY TO SAID SOLUTION, STRIPPING LIGHT HYDROCARBONS FROM THE RESULTING MIXTURE AND RETURNING MOST OF THE STRIPPED HYDROCARBONS TO THE CONVERSION ZONE.
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |