Patent US2844549A successfully refreshed from Google Patents.
US2844549A
Expired / Lapsed
US
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Method for the incorporation of lignin into synthetic rubber
Assignee: Uniroyal Inc
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Filing: 1954-07-28
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Granted: 1958-07-22
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Expires: 1974-07-28
Abstract
No abstract record available.
Inventors
- 👤 Raoul L Provost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:24
CPC Classifications
C; C08; C08L; C08L21/00; C08L23/00; C08L23/02; C08L23/16; C08L9/00; C08L9/06; C08L9/08; C08L97/00; C08L97/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF PREPARING SYNTHETIC RUBBER IN ADMIXTURE WITH 25 TO 75 PARTS OF LIGNIN PER 100 PARTS OF SYNTHETIC RUBBER WHICH COMPRISES MIXING AN AMOUNT OF SYNTHETIC RUBBER LATEX CONTAINING 25% TO 75% OF SAID 100 PARTS OF SYNTHETIC RUBBER WITH AN AQUEOUS ALKALI SOLUTION CONTAINING SUBSTANTIALLY ALL THE 25 TO 75 PARTS OF LIGNIN, CO-PRECIPITATING THE MIXTURE, MIXING SYNTHETIC RUBBER LATEX CONTAINING THE REMAINING 75% TO 25% OF SAID 100 PARTS OF SYNTHETIC RUBBER WITH THE FIRST SYNTHETIC RUBBER-LIGNIN CO-PRECIPITATE WITHOUT COAGULATION OF THE ADDED LATEX AND AFTER SUCH MIXING COAGULATING THE ADDED LATEX IN THE PRESENCE OF SAID FIRST CO-PRECIPITATE, AND FILTERING THE THUS FORMED MIXED COAGULUM, SAID SYNTHETIC RUBBER LATEX BEING AN AQUEOUS EMULSION POLYMERIZATE OF MATERIAL SELECTED FROM THE GROUP CONSISTING OF BUTADIENES-1,3 AND MIXTURES OF BUTADIENES-1,3 WITH COMPOUNDS CONTAINING A SINGLE CH2=C< GROUP WHICH ARE COPOLYMERIZABLE WITH BUTADIENE-1,3.
Claim 2
Independent Claim
144 words
THE METHOD OF PREPARING SYNTHETIC RUBBER IN ADMIXTURE WITH 25 TO 75 PARTS OF LIGNIN PER 100 PARTS OF SYNTHETIC RUBBER WHICH COMPRISES MIXING AN AMOUNT OF SYNTHETIC RUBBER LATEX CONTAINING 25% TO 75% OF SAID 100 PARTS OF SYNTHETIC RUBBER WITH AN AQUEOUS ALKALI SOLUTION CONTAINING SUBSTANTIALLY ALL THE 25 TO 75 PARTS OF LIGNIN, CO-PRECIPITATING THE MIXTURE, MIXING SYNTHETIC RUBBER LATEX CONTAINING THE REMAINING 75% TO 25% OF SAID 100 PARTS OF SYNTHETIC RUBBER WITH THE FIRST SYNTHETIC RUBBER-LIGNIN CO-PRECIPITATE WITHOUT COAGULATION OF THE ADDED LATEX AND AFTER SUCH MIXING COAGULATING THE ADDED LATEX IN THE PRESENCE OF SAID FIRST CO-PRECIPITATE, AND FILTERING THE THUS FORMED MIXED COAGULUM, SAID SYNTHETIC RUBBER LATEX BEING AN AQUEOUS EMULSION POLYMERIZATE OF MATERIAL SELECTED FROM THE GROUP CONSISTING OF BUTADIENES-1,3 AND MIXTURES OF BUTADIENES-1,3 WITH COMPOUNDS CONTAINING A SINGLE CH2=C< GROUP WHICH ARE COPOLYMERIZABLE WITH BUTADIENE-1,3.
References Cited (Backward Citations)
US2608537A
Cited
US2769789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |