Patent US2039625A successfully refreshed from Google Patents.
US3312643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing lignin reinforced rubber and product
Assignee: West Virginia Pulp and Paper Co
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Filing: 1961-03-20
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Granted: 1967-04-04
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Expires: 1981-03-20
Abstract
No abstract record available.
Inventors
- 👤 Frank J Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:34
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L9/08; B; B60; B60C; B60C1/00; C08L21/00; C08L21/02; C08L97/00; C08L97/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
THE METHOD WHICH COMPRISES COPRECIPITATING LIGNIN AND A BUTADIENE TYPE RUBBER TO FORM A SLURRY OF LIGNINRUBBER PARTICLES, MIXING FORMALKEHYDE WITH THE SLURRY OF LIGNIN-RUBBER PARTICLES, AND HEATING SAID SLURRY THEREBY CAUSING REACTION BETWEEN THE LIGNIN AND FORMALDEHYDE.
Claim 2
Independent Claim
38 words
THE METHOD WHICH COMPRISES COPRECIPITATING LIGNIN AND A BUTADIENE TYPE RUBBER TO FORM A SLURRY OF LIGNINRUBBER PARTICLES, MIXING FORMALKEHYDE WITH THE SLURRY OF LIGNIN-RUBBER PARTICLES, AND HEATING SAID SLURRY THEREBY CAUSING REACTION BETWEEN THE LIGNIN AND FORMALDEHYDE.
Claim 3
Dependent Claim
125 words
IN THE PREPARATION OF A LIGNIN REINFORCED RUBBER BY PREPARING A MIXTURE OF AN AQUEOUS ALKALINE SOLUTION OF LIGNIN AND A BUTADIENE TYPE RUBBER LATEX, COPRECIPITATING THE LIGNIN AND RUBBER FROM THE AQUEOUS MIXTURE TO FORM AN AQUEOUS SLURRY OF LIGNIN-RUBBER PARTICLES, SEPARATING SAID PARTICLES FROM THE SUPERNATANT LIQUID, DRYING THE LIGNIN RUBBER PARTICLES AND CMPOUNDING THE CURING THE DRIED LIGNIN-RUBBER MIXTURE, THE IMPROVEMENT WHICH COMPRISES ADDING A LIGNIN REACTIVE MATERIAL CONSISTING OF FORMALDEHYDE TO AN AQUEOUS SYSTEM CONTAINING THE LIGNIN BEFORE THE SEPARATION OF THE SUPERNATANT LIQUID FROM THE COPRECIPITATED LIGNIN-RUBBER PARTICLES AND HEATING THE RESULTANT AQUEOUS SYSTEM CONTAINING THE LIGNIN AND FORMALDEHYDE AT A TEMPERATURE OF AT LEAST 150*F. UNTIL ABOUT 0.6 TO 2.5 MOLES OF FORMALDEHYDE HAVE REACTED PER MOLE OF LIGNIN.
Claim 4
Dependent Claim
125 words
IN THE PREPARATION OF A LIGNIN REINFORCED RUBBER BY PREPARING A MIXTURE OF AN AQUEOUS ALKALINE SOLUTION OF LIGNIN AND A BUTADIENE TYPE RUBBER LATEX, COPRECIPITATING THE LIGNIN AND RUBBER FROM THE AQUEOUS MIXTURE TO FORM AN AQUEOUS SLURRY OF LIGNIN-RUBBER PARTICLES, SEPARATING SAID PARTICLES FROM THE SUPERNATANT LIQUID, DRYING THE LIGNIN RUBBER PARTICLES AND CMPOUNDING THE CURING THE DRIED LIGNIN-RUBBER MIXTURE, THE IMPROVEMENT WHICH COMPRISES ADDING A LIGNIN REACTIVE MATERIAL CONSISTING OF FORMALDEHYDE TO AN AQUEOUS SYSTEM CONTAINING THE LIGNIN BEFORE THE SEPARATION OF THE SUPERNATANT LIQUID FROM THE COPRECIPITATED LIGNIN-RUBBER PARTICLES AND HEATING THE RESULTANT AQUEOUS SYSTEM CONTAINING THE LIGNIN AND FORMALDEHYDE AT A TEMPERATURE OF AT LEAST 150*F. UNTIL ABOUT 0.6 TO 2.5 MOLES OF FORMALDEHYDE HAVE REACTED PER MOLE OF LIGNIN.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |