US2539766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triazine brightening agents
Assignee: Novartis AG
•
Filing: 1949-05-24
•
Granted: 1951-01-30
•
Expires: 1969-05-24
Abstract
No abstract record available.
Inventors
- 👤 Zweidler Reinhard
- 👤 Hausermann Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:45
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/621
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A BRIGHTENING AGENT COMPRISING A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
9 words
A BRIGHTENING AGENT COMPRISING A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2376743A
Cited
US2368444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |