Patent US4405546A successfully refreshed from Google Patents.
Patent USRE27145E successfully refreshed from Google Patents.
USRE27145E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Side-chain
Assignee: —
•
Filing: 1969-05-20
•
Granted: 1971-06-22
•
Expires: 1989-05-20
Abstract
Abstract HYDROGENATED BLOCK COPOLYMERS HAVING A SUPERIOR COMBINATION OF PHYSICAL PROPERTIES ARE PREPARED BY BLOCK POLYMERIZING A VINYL ARENE WITH BUTADIENE IN THE PRESENCE OF A POLAR COMPOUND TO CAUSE A LIMITED AMOUNT OF BRANCHING IN THE POLYBUTADINE BLOCK AND THEREAFTER HYDROGENATING THE POLYMER.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:40
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/04
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |