Patent US2849432A successfully refreshed from Google Patents.
US2849432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of diolefines
Assignee: Bridgestone Firestone Inc
•
Filing: 1956-02-06
•
Granted: 1958-08-26
•
Expires: 1976-02-06
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kibler
- 👤 Francis A Bozzacco
- 👤 Lawrence E Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:36
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
PROCESS OF POLYMERIZING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIOLEFINES AND MIXTURES THEREOF WITH OTHER UNSATURATED COMPOUNDS FREE OF HIGHLY NEGATIVE GROUPS COPOLYMERIZABLE THEREWITH, WHICH COMPRISES CONTACTING SAID SELECTED SUBSTANCE WITH A LITHIUM DIHYDROCARBON AMIDE IN WHICH THE HYDROCARBON GROUPS CONTAIN FROM 1 TO 40 CARBON ATOMS.
Claim 2
Dependent Claim
50 words
PROCESS OF POLYMERIZING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIOLEFINES AND MIXTURES THEREOF WITH OTHER UNSATURATED COMPOUNDS FREE OF HIGHLY NEGATIVE GROUPS COPOLYMERIZABLE THEREWITH, WHICH COMPRISES CONTACTING SAID SELECTED SUBSTANCE WITH A LITHIUM DIHYDROCARBON AMIDE IN WHICH THE HYDROCARBON GROUPS CONTAIN FROM 1 TO 40 CARBON ATOMS.
References Cited (Backward Citations)
GB339243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |