US2676931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin reinforced rubber and method of making same
Assignee: West Virginia Pulp and Paper Co
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Filing: 1952-06-05
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Granted: 1954-04-27
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Expires: 1972-06-05
Abstract
No abstract record available.
Inventors
- 👤 Pollak Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/02; C08L9/04; C08L21/00; C08L7/00; C08L7/02; C08L97/00; C08L97/005; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
AN ELASTOMER COMPRISED OF POLYMERIC BUTADIENE RUBBER AND A REINFORCING AGENT IN PROPORTIONS OF SUBSTANTIALLY 50 PARTS BY WEIGHT OF THE REINFORCING AGENT FOR 100 PARTS BY WEIGHT OF RUBBER, THE REINFORCING AGENT COMPRISING CARBON BLACK AND A SUBSTANTIAL PROPORTION OF LIGNIN FROM ABOUT 2 TO ABOUT 10 PARTS, SAID ELASTOMER HAVING A TENSILE STRENGTH GREATER THAN THAT FOR 50 PARTS OF CARBON BLACK ALONE, SAID ELASTOMER BEING PRODUCED BY STEPS WHICH COMPRISE COPRECIPITATING THE MIXTURE OF A LATEX OF THE RUBBER AND AN ALKALINE SOLUTION OF A LIGNIN, DRYING THE COAGULUM SO PRODUCED, MASTICATING AND SOFTENING AND EFFECTING BREAKDOWN OF THE SAME WITH THE LIGNIN AND CARBON BLACK SUBSTANTIALLY UNIFORMLY DISPERSED THROUGHOUT THE RUBBER.
Claim 2
Dependent Claim
115 words
AN ELASTOMER COMPRISED OF POLYMERIC BUTADIENE RUBBER AND A REINFORCING AGENT IN PROPORTIONS OF SUBSTANTIALLY 50 PARTS BY WEIGHT OF THE REINFORCING AGENT FOR 100 PARTS BY WEIGHT OF RUBBER, THE REINFORCING AGENT COMPRISING CARBON BLACK AND A SUBSTANTIAL PROPORTION OF LIGNIN FROM ABOUT 2 TO ABOUT 10 PARTS, SAID ELASTOMER HAVING A TENSILE STRENGTH GREATER THAN THAT FOR 50 PARTS OF CARBON BLACK ALONE, SAID ELASTOMER BEING PRODUCED BY STEPS WHICH COMPRISE COPRECIPITATING THE MIXTURE OF A LATEX OF THE RUBBER AND AN ALKALINE SOLUTION OF A LIGNIN, DRYING THE COAGULUM SO PRODUCED, MASTICATING AND SOFTENING AND EFFECTING BREAKDOWN OF THE SAME WITH THE LIGNIN AND CARBON BLACK SUBSTANTIALLY UNIFORMLY DISPERSED THROUGHOUT THE RUBBER.
Claim 3
Independent Claim
80 words
THE METHOD OF MAKING A REINFORCED ELASTOMER WHICH COMRISES MIXING AQUEOUS ALKALI LIGNATE AND A LATEX OF A POLYMERIC BUTADIENE RUBBER, COPRECIPITATING THE RUBBER AND LIGNIN TO PRODUCE A COAGULUM CONTAINING THE RUBBER AND LIGNIN, DRYING THE COAGULUM, MASTICATING AND SOFTENING AND EFFECTING BREAKDOWN OF THE SAME TO FORM A REINFORCED ELASTOMER HAVING THE LIGNIN SUBSTANTIALLY UNIFORMLY DISPERSED THERETHROUGH IN AMOUNTS GREATER THAN THOSE REQUIRED IN USE AND THEREAFTER MILLING SAID ELASTOMER AND ADDING ADDITIONAL UNCURED RUBBER DURING THE MILLING.
Claim 4
Independent Claim
80 words
THE METHOD OF MAKING A REINFORCED ELASTOMER WHICH COMRISES MIXING AQUEOUS ALKALI LIGNATE AND A LATEX OF A POLYMERIC BUTADIENE RUBBER, COPRECIPITATING THE RUBBER AND LIGNIN TO PRODUCE A COAGULUM CONTAINING THE RUBBER AND LIGNIN, DRYING THE COAGULUM, MASTICATING AND SOFTENING AND EFFECTING BREAKDOWN OF THE SAME TO FORM A REINFORCED ELASTOMER HAVING THE LIGNIN SUBSTANTIALLY UNIFORMLY DISPERSED THERETHROUGH IN AMOUNTS GREATER THAN THOSE REQUIRED IN USE AND THEREAFTER MILLING SAID ELASTOMER AND ADDING ADDITIONAL UNCURED RUBBER DURING THE MILLING.
References Cited (Backward Citations)
US2355180A
Cited
US2575061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |