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Patent US3434799A successfully refreshed from Google Patents.
US3434799A
Expired / Lapsed
US
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Process for preparing pigmentary titanium dioxide
Assignee: PPG Industries Inc
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Filing: 1965-04-14
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Granted: 1969-03-25
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Expires: 1985-04-14
Abstract
No abstract record available.
Inventors
- 👤 William L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:51
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/04; C09C3/043; C09C3/06; C09C3/063; C09C3/08; C09C3/12; C01P; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3068113A
Cited
US3208866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |