US2807577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic after treatment of carbon black
Assignee: Godfrey L Cabot Inc
•
Filing: 1956-04-25
•
Granted: 1957-09-24
•
Expires: 1976-04-25
Abstract
No abstract record available.
Inventors
- 👤 Antonsen Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:29
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR IMPROVING THE SURFACE CHARACTERISTICS OF CARBON BLACK WHICH COMPRISES SUBJECTING THE CARBON BLACK WHILE IN AN AQUEOUS SUSPENSION IN CONTACT WITH THE POSITIVE ELECTRODE OF A DIRECT CURRENT ACTIVATED ELECTROLYTIC CELL AND OUT OF CONTACT WITH THE NEGATIVE ELECTRODE THEREIN TO THE PASSAGE OF AT LEAST 0.002 FARADAY OF DIRECT CURRENT PER GRAM OF BLACK THROUGH THE AQUEOUS ELECTROLYTE BETWEEN SAID ELECTRODES, AND THEN RECOVERING THE MODIFIED BLACK.
Claim 2
Dependent Claim
71 words
A PROCESS FOR IMPROVING THE SURFACE CHARACTERISTICS OF CARBON BLACK WHICH COMPRISES SUBJECTING THE CARBON BLACK WHILE IN AN AQUEOUS SUSPENSION IN CONTACT WITH THE POSITIVE ELECTRODE OF A DIRECT CURRENT ACTIVATED ELECTROLYTIC CELL AND OUT OF CONTACT WITH THE NEGATIVE ELECTRODE THEREIN TO THE PASSAGE OF AT LEAST 0.002 FARADAY OF DIRECT CURRENT PER GRAM OF BLACK THROUGH THE AQUEOUS ELECTROLYTE BETWEEN SAID ELECTRODES, AND THEN RECOVERING THE MODIFIED BLACK.
References Cited (Backward Citations)
US1314632A
Cited
US1062431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |