Patent US3505091A successfully refreshed from Google Patents.
US3505091A
Expired / Lapsed
US
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Production of titanium dioxide pigments
Assignee: EIDP Inc
•
Filing: 1968-07-29
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Granted: 1970-04-07
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Expires: 1988-07-29
Abstract
No abstract record available.
Inventors
- 👤 Pedro Carlos Santos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:08
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2488439A
Cited
US2559638A
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US2653078A
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US2670272A
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GB926716A
Cited
US3203763A
Cited
US3208866A
Cited
US3219411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |