Patent US2390804A successfully refreshed from Google Patents.
Patent US2852580A successfully refreshed from Google Patents.
US2852580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyisoolefins
Assignee: Universal Oil Products Co
•
Filing: 1955-09-26
•
Granted: 1958-09-16
•
Expires: 1975-09-26
Abstract
No abstract record available.
Inventors
- 👤 Edward M Geiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:45
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR THE PREPARATION OF A POLYSIOOLEFIN WHICH COMPRISES POLYMERIZING A MONO-ISO-OLEFIN IN AN N,N-DIALKYLAMIDE AT A TEMPERATURE OF FROM ABOUT 0* TO ABOUT -40*C. IN THE PRESENCE OF A POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND HYDROGEN FLUORIDE, AND RECOVERING THE RESULTANT POLYISO-OLEFIN.
Claim 2
Dependent Claim
49 words
A PROCESS FOR THE PREPARATION OF A POLYSIOOLEFIN WHICH COMPRISES POLYMERIZING A MONO-ISO-OLEFIN IN AN N,N-DIALKYLAMIDE AT A TEMPERATURE OF FROM ABOUT 0* TO ABOUT -40*C. IN THE PRESENCE OF A POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND HYDROGEN FLUORIDE, AND RECOVERING THE RESULTANT POLYISO-OLEFIN.
References Cited (Backward Citations)
US2690417A
Cited
US2709642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |