Patent US2989573A successfully refreshed from Google Patents.
US2989573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic polymerization of diolefins using pentaborane
Assignee: ATK Launch Systems LLC
•
Filing: 1958-07-16
•
Granted: 1961-06-20
•
Expires: 1978-07-16
Abstract
No abstract record available.
Inventors
- 👤 David M Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:24
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD FOR THE PREPARATION OF A LIQUID POLYMER OF A CONJUGATED DIENE HYDROCARBON HAVING 4 TO 5 CARBON ATOMS WHICH COMPRISES HEATING A GASEOUS CONJUGATED DIENE HYDROCARBON IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF PENTABORANE-9 AT A TEMPERATURE WITHIN THE RANGE FROM 175*C. TO 250*C. AND RECOVERING A LIQUID POLYMER OF THE CONJUGATED DIENE HYDROCARBON FROM THE REACTION MIXTURE, THE MOLAR RATIO OF PENTABORANE-9 TO CONJUGATED DIENE HYDROCARBON PRESENT IN THE REACTION MIXTURE BEING WITHIN THE RANGE FROM 0.1:100 TO 10:100.
Claim 2
Independent Claim
84 words
A METHOD FOR THE PREPARATION OF A LIQUID POLYMER OF A CONJUGATED DIENE HYDROCARBON HAVING 4 TO 5 CARBON ATOMS WHICH COMPRISES HEATING A GASEOUS CONJUGATED DIENE HYDROCARBON IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF PENTABORANE-9 AT A TEMPERATURE WITHIN THE RANGE FROM 175*C. TO 250*C. AND RECOVERING A LIQUID POLYMER OF THE CONJUGATED DIENE HYDROCARBON FROM THE REACTION MIXTURE, THE MOLAR RATIO OF PENTABORANE-9 TO CONJUGATED DIENE HYDROCARBON PRESENT IN THE REACTION MIXTURE BEING WITHIN THE RANGE FROM 0.1:100 TO 10:100.
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |