Patent US3903168A successfully refreshed from Google Patents.
US3903168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable anionic polymerization initiator
Assignee: EIDP Inc
•
Filing: 1973-11-23
•
Granted: 1975-09-02
•
Expires: 1993-11-23
Abstract
Abstract The sequential reaction of m-diisopropenylbenzene, an alkyllithium and butadiene or isoprene in the presence of 0.01 to 1.0 mole of a tertiary amine per mole of mdiisopropenylbenzene/alkyllithium adduct in a hydrocarbon solvent yields stable solutions of anionic polymerization initiators suitable for the polymerization of dienes.
Inventors
- 👤 Robert P Foss
- 👤 Henning W Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:28
CPC Classifications
C; C07; C07F; C07F1/00; C07F1/02; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
8 words
Compound of claim 1 wherein R is methyl.
Claim 4
Dependent Claim
8 words
Compound of claim 2 wherein R1 is sec-butyl.
Claim 5
Dependent Claim
8 words
Compound of claim 3 wherein R2 is ethyl.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |