US3233969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pigmentary silica
Assignee: Columbian Carbon Co
•
Filing: 1961-05-29
•
Granted: 1966-02-08
•
Expires: 1981-05-29
Abstract
No abstract record available.
Inventors
- 👤 George L Heller
- 👤 James W White
- 👤 Jr Elton F Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:36
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; B; B82; B82Y; B82Y30/00; C01B33/00; C01B33/08; C01B33/107; C01B33/10705; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B33/184; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/11; C01P2006/12; C01P2006/19; C01P2006/80; C01P2006/82; C01P2006/90; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US993913A
Cited
US2332527A
Cited
US2535036A
Cited
US2621111A
Cited
US2631083A
Cited
US3014790A
Cited
US2819151A
Cited
US2861872A
Cited
US2912342A
Cited
US2990249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |