Patent US2740187A successfully refreshed from Google Patents.
Patent US3170903A successfully refreshed from Google Patents.
US3170903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diolefin polymerization with lithium adduct of a polynuclear aromatic hydrocarbon
Assignee: Bridgestone Firestone Inc
•
Filing: 1961-03-02
•
Granted: 1965-02-23
•
Expires: 1981-03-02
Abstract
No abstract record available.
Inventors
- 👤 Richard S Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR THE PRODUCTION OF A RUBBERY POLYMER, COMPRISING HOMOPOLYMERIZING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ISOPRENE AND BUTADIENE, BY CONTACTING SAID MATERIAL WITH A CATALYST CONSISTING ESSENTIALLY OF AN ADDUCT OF LITHIUM WITH A POLYNUCLEAR AROMATIC HYDROCARBON COMPOUND, IN THE PRESENCE OF A SOLVENT FOR SAID MATERIAL CONSISTING OF HYDROCARBON.
Claim 2
Dependent Claim
54 words
A PROCESS FOR THE PRODUCTION OF A RUBBERY POLYMER, COMPRISING HOMOPOLYMERIZING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ISOPRENE AND BUTADIENE, BY CONTACTING SAID MATERIAL WITH A CATALYST CONSISTING ESSENTIALLY OF AN ADDUCT OF LITHIUM WITH A POLYNUCLEAR AROMATIC HYDROCARBON COMPOUND, IN THE PRESENCE OF A SOLVENT FOR SAID MATERIAL CONSISTING OF HYDROCARBON.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |