Patent US3778490A successfully refreshed from Google Patents.
US3778490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polar compound adjuvants for improved block polymers prepared with primary hydrocarbyllithium initiators
Assignee: Phillips Petroleum Co
•
Filing: 1971-06-25
•
Granted: 1973-12-11
•
Expires: 1991-06-25
Abstract
Abstract HIGH RAW TENSILE STRENGTH RADIAL AND LINEAR BLOCK POLYMERS ARE PREPARED BY THE INCREMENTAL ADDITION OF MONOMERS EMPLOYING A PARTICULAR SEQUENCE OF ADDITION USING PROMARY HYDROCARBYLLITHIUM INITIATORS WITH SMALL AMOUNTSL OF POLAR COMPOUND ADJUVANTS, FOLLOWED BY THE ADDITION OF A POLYFUNCTIONAL TREATING AGENT.
Inventors
- 👤 H Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:57
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |