Patent US3272831A successfully refreshed from Google Patents.
US3272831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridotriazole brighteners
Assignee: Wyeth Holdings LLC
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Filing: 1964-08-25
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Granted: 1966-09-13
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Expires: 1984-08-25
Abstract
No abstract record available.
Inventors
- 👤 Buell Bennett George
- 👤 Long Robert Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:28
CPC Classifications
C; C09; C09B; C09B57/00
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |