US3232891A
Expired / Lapsed
US
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Process for removing carbon black from polyethylene
Assignee: Union Carbide Canada Ltd
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Filing: 1961-11-03
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Granted: 1966-02-01
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Expires: 1981-11-03
Abstract
No abstract record available.
Inventors
- 👤 George L Batz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08J11/08; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PROCESS FOR SEPARATING CARBON BLACK FROM ADMIXTURE WITH POLYETHYLENE WHICH COMPRISES DISSOLVING POLYETHYLENE CONTAINING CARBON BLACK IN AN ORGANIC SOLVENT, ADDING TO THE THUS FORMED SOLUTION A MINERAL ACID TYPE COAGULATING AGENT HAVING AN IONIZATION CONSTANT NOT LESS THAN 1.0X10**-7 HEATING SAID SOLUTION AT REFLUX TEMPERATURE AND THEN SEPARATING THE THUS FORMED COAGULATE OF CARBON BLACK FROM SAID SOLUTION, WITH SUBSTANTIALLY AL OF SAID POLYETHYLENE REMAINING IN SAID SOLUTION.
Claim 2
Dependent Claim
69 words
PROCESS FOR SEPARATING CARBON BLACK FROM ADMIXTURE WITH POLYETHYLENE WHICH COMPRISES DISSOLVING POLYETHYLENE CONTAINING CARBON BLACK IN AN ORGANIC SOLVENT, ADDING TO THE THUS FORMED SOLUTION A MINERAL ACID TYPE COAGULATING AGENT HAVING AN IONIZATION CONSTANT NOT LESS THAN 1.0X10**-7 HEATING SAID SOLUTION AT REFLUX TEMPERATURE AND THEN SEPARATING THE THUS FORMED COAGULATE OF CARBON BLACK FROM SAID SOLUTION, WITH SUBSTANTIALLY AL OF SAID POLYETHYLENE REMAINING IN SAID SOLUTION.
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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |