US3654218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming an elastomer-carbon black mixture
Assignee: Evonik Operations GmbH
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Filing: 1969-08-22
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Granted: 1972-04-04
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Expires: 1989-08-22
Abstract
Abstract A RUBBER LATEX IS COAGULATED IN THE PRESENCE OF AN AQUEOUS DISPERSION OF FINELY DIVIDED CARBON BLACK, THE DISPERSION BEING FORMED AT A PH OF 1 TO 2. THE COAGULATE MAY THEN BE SUBJECTED TO WASHING, FILTERING AND DRYING AND THE THUS-FORMED GRANULATE MAY SUBSEQUENTLY BE SUBJECTED TO A GRINDING STEP. THE GRANULATE HAS SUBSTANTIALLY NO TENDENCY TO CAKE WITHOUT THE NECESSITY OF ADDING ADDITIONAL SEPARATING AGENTS.
Inventors
- 👤 Willi Clas
- 👤 Wolfgang Buchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; C08L; C08L21/00; C08J2321/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |