US3151106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridinium azo dyes and process for their production
Assignee: Wyeth Holdings LLC
•
Filing: 1958-09-30
•
Granted: 1964-09-29
•
Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 Tsang Sien Moo
- 👤 Charles E Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/10; C09B44/12; C09B44/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
AS A DYESTUFF A 1-METHYL-4-(2,6-DIAMINO-3-PYRIDYLAZO) PYRIDINIUM SALT.
Claim 2
Dependent Claim
7 words
AS A DYESTUFF A 1-METHYL-4-(2,6-DIAMINO-3-PYRIDYLAZO) PYRIDINIUM SALT.
References Cited (Backward Citations)
US2864813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |