US3475124A
Expired / Lapsed
US
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Method of preparing pigmentary metal oxides
Assignee: PPG Industries Inc
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Filing: 1968-05-22
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Granted: 1969-10-28
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Expires: 1988-05-22
Abstract
No abstract record available.
Inventors
- 👤 Donald E Darr
- 👤 George Byron Edwards
- 👤 Clifford E Loehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:27
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B13/30; C01B25/00; C01B25/12; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B35/08; C01B35/10; C01F; C01F7/00; C01F7/02; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01G23/075
Claims Analysis
Total Claims: 0
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |