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Patent US3051704A successfully refreshed from Google Patents.
US3051704A
Expired / Lapsed
US
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Optical brightening agents of the 4, 4'-bis-(triazinylamino)-stilbene disulfonic acid series
Assignee: BASF SE
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Filing: 1960-01-19
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Granted: 1962-08-28
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Expires: 1980-01-19
Abstract
No abstract record available.
Inventors
- 👤 Gehm Robert
- 👤 Schmidt Oswald
- 👤 Mertens Heinrich
- 👤 Grunwald Wolfgang
- 👤 Hehl Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:49
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A WATER-SOLUBLE COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
A WATER-SOLUBLE COMPOUND OF THE FORMULA
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) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |