US3058989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridotriazole brighteners
Assignee: Wyeth Holdings LLC
•
Filing: 1957-11-26
•
Granted: 1962-10-16
•
Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Bennett G Buell
- 👤 Robert S Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE STRUCTURE:
Claim 2
Dependent Claim
4 words
COMPOUNDS OF THE STRUCTURE:
References Cited (Backward Citations)
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Cited
US2647904A
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US2247266A
Cited
US2638403A
Cited
US2637731A
Cited
US2784183A
Cited
US2750385A
Cited
US2824876A
Cited
US2845425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |