US3468689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing improved titanium dioxide
Assignee: PPG Industries Inc
•
Filing: 1965-08-09
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Granted: 1969-09-23
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Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Harry Lott Jr
- 👤 Albert Dietz
- 👤 Donald E Darr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:35
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/006; C09C1/00; C09C1/36; C09C1/3692; C09C3/06; C09C3/063; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2628919A
Cited
GB684016A
Cited
US2817595A
Cited
US3203818A
Cited
US3172772A
Cited
US3212911A
Cited
US3152000A
Cited
US3337300A
Cited
US3310377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |