Patent US4843397A successfully refreshed from Google Patents.
Patent US2572884A successfully refreshed from Google Patents.
US2572884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redispersing and compounding rubber
Assignee: West Virginia Pulp and Paper Co
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Filing: 1948-02-26
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Granted: 1951-10-30
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Expires: 1968-02-26
Abstract
No abstract record available.
Inventors
- 👤 Pollak Arthur
- 👤 Jr John J Keilen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:50
CPC Classifications
C; C08; C08L; C08L11/00; C08L11/02; C08L21/00; C08L7/00; C08L7/02; C08L9/00; C08L9/02; C08L9/04; C08L9/06; C08L9/08; C08L97/00; C08L97/005; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN THE MANUFACTURE OF SHAPED AND CURED RUBBER ARTICLE THE STEPS OF PREPARING A MIXTURE OF A LATEX OF A RUBBERY BUTADIENE 1,3 POLYMER AND A REINFORCING AGENT INCLUDING LIGNIN, ACID PRECIPITATING SAID MIXTURE AND OBTAINING A COPRECIPITATE OF SAID POLYMER AND REINFORCING AGENT IN WHICH SAID POLYMER IS IN THE FORM OF WET SUBSTANTIALLY NON-COALESCENT PARTICLES, SEPARATING SAME FROM THE ATTENDANT SOLUTION TO YIELD A WET MASS WHICH IS SUBSTANTIALLY FREE FROM ACID AND WATER SOLUBLE MATERIAL AND IN WHICH SAID POLYMER PARTICLES ARE STILL SUBSTANTIALLY NON-COALESCENT, DISPERSING RUBBER COMPOUNDING AGENTS IN SAID MASS TO YIELD AN AQUEOUS DISPERSION CONTAINING THE POLYMER, REINFORCING AGENT AND RUBBER COMPRISING AGENTS, AND DRYING THE DISPERSION SO FORMED.
Claim 2
Dependent Claim
115 words
IN THE MANUFACTURE OF SHAPED AND CURED RUBBER ARTICLE THE STEPS OF PREPARING A MIXTURE OF A LATEX OF A RUBBERY BUTADIENE 1,3 POLYMER AND A REINFORCING AGENT INCLUDING LIGNIN, ACID PRECIPITATING SAID MIXTURE AND OBTAINING A COPRECIPITATE OF SAID POLYMER AND REINFORCING AGENT IN WHICH SAID POLYMER IS IN THE FORM OF WET SUBSTANTIALLY NON-COALESCENT PARTICLES, SEPARATING SAME FROM THE ATTENDANT SOLUTION TO YIELD A WET MASS WHICH IS SUBSTANTIALLY FREE FROM ACID AND WATER SOLUBLE MATERIAL AND IN WHICH SAID POLYMER PARTICLES ARE STILL SUBSTANTIALLY NON-COALESCENT, DISPERSING RUBBER COMPOUNDING AGENTS IN SAID MASS TO YIELD AN AQUEOUS DISPERSION CONTAINING THE POLYMER, REINFORCING AGENT AND RUBBER COMPRISING AGENTS, AND DRYING THE DISPERSION SO FORMED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |