US3296158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing lignin reinforced rubber and product thereof
Assignee: West Virginia Pulp and Paper Co
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Filing: 1961-03-23
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Granted: 1967-01-03
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Expires: 1981-03-23
Abstract
No abstract record available.
Inventors
- 👤 Mitchell S Dimitri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L9/08; C08L21/00; C08L21/02; C08L97/00; C08L97/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A BUTADIENE TYPE RUBBER STOCK WHICH HAS BEEN SUBJECTED TO A HEAT TREATMENT AT A TEMPERATURE ABOVE 300*F. COMPRISING 100 PARTS OF RUBBER STOCK AND FROM ABOUT 25 TO 100 PARTS OF LIGNIN IN THE FORM OF A POLYVALENT METAL LIGNATE.
Claim 2
Dependent Claim
41 words
A BUTADIENE TYPE RUBBER STOCK WHICH HAS BEEN SUBJECTED TO A HEAT TREATMENT AT A TEMPERATURE ABOVE 300*F. COMPRISING 100 PARTS OF RUBBER STOCK AND FROM ABOUT 25 TO 100 PARTS OF LIGNIN IN THE FORM OF A POLYVALENT METAL LIGNATE.
Claim 3
Independent Claim
64 words
THE METHOD WHICH COMPRISES EFFECTING COPRECIPITATION OF LIGNIN AND BUTADIENE TYPE RUBBER FROM A MIXTURE OF AN AQUEOUS ALKALINE SOLUTION OF LIGNIN AND A RUBBER LATEX BY ADDITION OF THE MIXTURE TO AN AQUEOUS SOLUTION OF A POLYVALENT METALLIC SALT, SEPARATING THE SUPERNATANT LIQUID FROM THE THUS COPRECIPITATED LIGNIN-RUBBER, DRYING THE COPRECIPITATED LIGNIN-RUBBER AND SUBJECTING THE DRIED LIGNINRUBBER TO A HEAT TREATMENT ABOVE 300*F.
Claim 4
Independent Claim
64 words
THE METHOD WHICH COMPRISES EFFECTING COPRECIPITATION OF LIGNIN AND BUTADIENE TYPE RUBBER FROM A MIXTURE OF AN AQUEOUS ALKALINE SOLUTION OF LIGNIN AND A RUBBER LATEX BY ADDITION OF THE MIXTURE TO AN AQUEOUS SOLUTION OF A POLYVALENT METALLIC SALT, SEPARATING THE SUPERNATANT LIQUID FROM THE THUS COPRECIPITATED LIGNIN-RUBBER, DRYING THE COPRECIPITATED LIGNIN-RUBBER AND SUBJECTING THE DRIED LIGNINRUBBER TO A HEAT TREATMENT ABOVE 300*F.
References Cited (Backward Citations)
GB781019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |